Author: Hristina Tankovska

Email marketing myths rarely look dangerous. They look like good advice: skip the word “free,” send on Tuesday, grow the list at any cost. When your opens start slipping, those habits are a likely cause, because each one damages a signal inbox providers use to decide where your email lands. And some of the opens you’re worried about may never have been real in the first place.

The 4 signals every email marketing myth gets wrong

Every myth on this list fails for the same reason: it works against one of the four signals inbox providers like Gmail, Yahoo, and Outlook use to decide where your email lands. Those signals are authentication, sender reputation, spam complaints, and engagement.

Placement comes first and opens come second. An email that lands in spam rarely gets opened, however good the subject line is.

Signal	What inbox providers check	What to aim for
Authentication	Proof that you’re allowed to send from your domain	SPF, DKIM, and DMARC records set up for your domain
Sender reputation	Your track record: bounces, inactive contacts, and how consistently you send	A hard bounce rate under 2% and a steady sending schedule
Spam complaints	How often recipients click “Report spam”	A spam rate under 0.3% (ideally under 0.1%) and one-click unsubscribe, processed within 48 hours
Engagement	Whether people open, click, and reply	Clicks holding steady or rising across campaigns

Inbox providers don’t publish limits for reputation and email engagement, but you can still track both. You build them over time with every campaign you send.

The other two are now hard rules. Google and Yahoo introduced sender requirements in 2024, and Microsoft followed for Outlook.com, Hotmail.com, and Live.com in May 2025. Since November 2025, Gmail rejects emails that don’t comply instead of just warning the sender. 

The strictest rules apply to bulk senders, meaning anyone who sends close to 5,000 or more messages to personal Gmail accounts within 24 hours. Smaller senders aren’t off the hook, though. Every sender has to meet a baseline: SPF or DKIM authentication, a spam rate under 0.3%, and valid DNS records for the sending domain and servers.

The seven myths below all sound harmless. Each one quietly works against at least one of these signals.

Myth 1: Email marketing is dead

Email marketing isn’t dead. In the Data & Marketing Association’s Marketer Email Tracker 2026, a survey of 250 UK marketers, the estimated return on email rose to about £41 for every £1 spent, up from around £38 in the previous edition.

Social media, messaging apps, and now AI assistants have all been called email’s replacement. What this myth breaks is sender reputation. Businesses that treat email as a side channel send irregularly, stop cleaning their lists, and let contacts go stale. When they finally send a campaign, bounces and complaints spike, results disappoint, and the myth seems confirmed. It’s a self-fulfilling prophecy with a very measurable paper trail.

Compare email to your other channels before you cut it

Before you move budget away from email, put it side by side with the marketing channels you’d move it to:

• Pull revenue or leads by channel for the same period, such as the last 90 days.
• Count how much of each audience you actually own. Your list stays yours if an algorithm changes; your followers don’t.
• Calculate your email marketing ROI using real sales data, not open rates.

If email still loses after that comparison, look at how the program is run before you blame the channel.

Myth 2: Avoiding spam trigger words keeps you safe

Spam trigger words rarely decide whether an email reaches the inbox. Google’s sender requirements don’t list banned words at all. Instead, they cover technical basics like authentication, spam rate, and unsubscribe rules. And when Google explains how Gmail’s spam filters work, the factors it names are “IP address, domains/subdomains, sender authentication, and user input.”

Using words like “free” occasionally won’t hurt you, but stacking them makes you look like spam. All-caps urgency and phishing-style wording still look suspicious for reasons beyond any single word.

What this myth breaks is authentication. Senders spend hours scrubbing “free” and exclamation points from their subject lines while their domain has no SPF, DKIM, or DMARC records, which is the first thing inbox filters check. The result is a flat subject line, sent from a domain filters can’t verify.

Set up SPF, DKIM, and DMARC before you rewrite a single word

Authentication is the part of email deliverability that filters check first. Confirm these three records exist for the domain in your From address:

• SPF: lists the servers allowed to send email for your domain.
• DKIM: adds a signature that proves the email wasn’t changed in transit.
• DMARC: tells inbox providers what to do when SPF or DKIM fails. Google and Microsoft both accept a starting policy of p=none, as long as your From domain aligns with SPF or DKIM.

Once those pass, you can write “free” where it’s honest without worrying about the word itself.

Myth 3: A bigger list means more opens

A bigger list doesn’t bring more opens if the extra contacts don’t want your emails. Invalid addresses bounce, inactive ones ignore you, and purchased ones report you as spam. All three drag down sender reputation.

The myth usually shows up as buying lists or importing contacts who never confirmed they wanted your emails. Both fill your list with addresses that bounce, and the damage is easy to measure: SiteGround’s deliverability guidance treats a hard bounce rate above 2% as a sign of list quality problems.

The simplest prevention is a double opt-in, which asks new subscribers to confirm their address before they join. It catches typos, fake sign-ups, and spam traps before they turn into bounces.

Remove bounced and inactive contacts on a schedule

Regular list cleaning keeps your list size honest:

• Remove hard bounces after every campaign, because those addresses won’t start working again.
• Pick an inactivity window, such as 180 days without a click, and send those contacts one re-engagement email before removing them.
• Never import a purchased list, no matter how targeted it claims to be.

In SiteGround Email Marketing, the first step happens automatically. Contacts that hard bounce move to the Suppressed tab and won’t receive emails unless you change their status manually, while soft bounces stay on your list because the cause may be temporary. Contacts who report your email as spam are moved to the Unsubscribed tab. You can review all four statuses (Subscribed, Unsubscribed, Unconfirmed, and Suppressed) under Client Area > Services > Email Marketing > Contacts > Contact List.

Myth 4: Unsubscribes mean your emails are failing

Unsubscribes don’t mean your emails are failing. They’re the safe exit for a reader who’s no longer interested, and the alternative exit, a spam report, costs far more.

Google says it directly: unwanted messages without one-click unsubscribe are more likely to be reported as spam, and more reports push future messages toward the spam folder. Hiding the link in tiny gray text or requiring a login doesn’t keep subscribers. It turns a quiet exit into a complaint that counts against your spam rate. Understanding why people unsubscribe is more useful than trying to stop them.

Put a one-click unsubscribe where people can find it

• Place a clearly labeled unsubscribe link in every marketing email’s footer.
• Make it work in one click, with no login or password required.
• Process requests within 48 hours, which matches Google’s requirement.
• Tell subscribers how often you’ll email them when they sign up, so nobody unsubscribes because of a surprise.
• Track your unsubscribe rate per campaign to spot content that consistently pushes people away.

Myth 5: There’s a perfect time and frequency to send

There’s no universal best time or frequency to send email. Send-time studies name different winners, from Tuesday to Friday, because the right schedule depends on who’s reading: their time zones, their routines, and what they signed up for. 

Frequency is just as personal. The DMA’s 2026 tracker found around 14% of customers get four or more emails a week from a single brand. Whether that’s welcome or too much depends entirely on the audience.

The myth breaks engagement in two directions. A copied “best” time puts you in the same crowded window as everyone else. And treating “less” as always safer backfires too. Sending less often can help subscribers who’ve stopped engaging, but long gaps and subscribers are more likely to forget your name and report you. Sudden spikes after a quiet period look suspicious as well: Google ties eligibility for its built-in unsubscribe button partly to increasing sending volumes gradually.

Test send times and frequency on your own list

• Split your list and send the same email at two different times, then compare clicks.
• Pick a cadence you can keep, weekly or biweekly, and stick to it for at least a few months before judging it.
• Watch unsubscribe and spam rates after you increase frequency. If they rise, your audience has answered for you.

In SiteGround Email Marketing, you can run this test by splitting contacts into two groups, scheduling the same campaign for each at different times, and filtering Analytics by group to compare clicks.

Myth 6: Landing in the Promotions tab means your email failed

Landing in Gmail’s Promotions tab doesn’t mean your email failed. The Promotions tab is part of the inbox: Gmail files marketing emails there automatically, and readers open them like any other message.

The damage comes from trying to escape it. Stripping out images, disguising campaigns as personal notes, or adding “Re:” to subject lines surprises subscribers with a sales pitch where they expected a friend. A surprised reader ignores the email or reports it, which hurts engagement and complaints at once. The tab isn’t the penalty. The workaround is.

Design for the Promotions tab instead of trying to escape it

In the Promotions tab, your email competes on three things readers see before they open it: sender name, subject line, and preheader.

• Use a sender name subscribers recognize, such as your brand or a real person at your company, and keep it consistent.
• Write a preheader that adds information instead of repeating the subject line.
• Make the subject line match what’s inside, so the open doesn’t end in disappointment.
• If your most engaged subscribers want to see you first, tell them they can drag your email into the Primary tab.

Myth 7: Open rate is the most important email metric

Open rate isn’t the most important email metric, and since 2021 it hasn’t been a reliable one. Apple Mail Privacy Protection downloads remote content, including tracking pixels, in the background for the many users who turn it on, whether or not the reader opens the email.

That means an open can register the moment your email arrives in Apple Mail, even if nobody reads it. Inbox providers still see how people actually interact with your email. Apple’s feature only changes what you see in your reports.

What this breaks:

• Your open rate: it’s partly made up of opens that never happened, and so are the benchmarks you compare it to.
• Your trend lines: a drop or a spike can say more about how many subscribers use Apple Mail than about your emails.
• Your list cleaning: removing contacts based on opens alone can keep people who never read anything and delete readers who block tracking.

Base inactivity rules on clicks where you can, such as no clicks in 180 days, and use opens only as a backup signal.

Judge each email by clicks and conversions, not opens

• Use clicks as your main engagement signal, since they require a real action from a real person.
• Track conversions, such as purchases, bookings, or replies, as the measure of whether an email worked.
• Treat email open rate as a rough trend line within the same audience, not a success score.
• Understand the difference between CTR and CTOR, since CTOR uses opens as its denominator and inherits the same inflation.

How to test the next email rule you hear

Any new email rule deserves three questions before it changes how you send.

• Which signal does it affect? If a rule can’t be tied to authentication, reputation, complaints, or engagement, it’s a style preference, not a deliverability rule.
• Is there a primary source? Google, Yahoo, Microsoft, Apple, and your email platform publish their requirements. A rule that only appears in blog posts quoting other blog posts deserves suspicion.
• Can you test it on your own list? Send times, frequency, and subject line styles can all be split-tested. Your list’s results beat any benchmark.

Run “never email on Mondays” through the test, for example. It doesn’t touch authentication or complaints, no inbox provider publishes it, and a two-week split send will tell you whether it holds for your audience. That’s a test, not a rule.

Build those three questions into your email marketing strategy, and the next viral tip gets a fair trial instead of automatic obedience.

Stop letting email marketing myths run your campaigns

Email marketing myths stick around because they feel responsible. Skipping “free” feels safe. Keeping every contact feels like growth. Hiding the unsubscribe link feels like damage control. Meanwhile, each habit chips away at the signals that decide inbox placement, and the bill arrives months later as a mystery drop in results. Trade the rules of thumb for what inbox providers actually publish and what your own list tells you. Your numbers will finally start telling the truth.

If you’d rather not babysit DNS records and bounce lists yourself, SiteGround Email Marketing handles a lot of it for you. If your domain is registered or hosted with SiteGround, it sets up SPF, DKIM, and DMARC for you automatically. It blocks campaigns from domains missing those records, suppresses hard bounces, and moves spam reporters to your Unsubscribed list. Bounce, spam, and unsubscribe rates are all waiting for you in Analytics.

New users also get a manual review of their first three campaigns, so mistakes get caught before your sender reputation pays for them. You can try it free for 30 days.

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Frequently asked questions about email marketing myths

The right email banner size is 600px wide, the same width as your email template. That one number covers both your header and your hero banner, and only the height changes between them. It sounds like a minor detail until you get it wrong. Go any wider and Outlook chops off the edge, while phones shrink the text in your banner down to fine print. SiteGround Email Marketing layouts already set the width and handle mobile scaling, so all you need to bring is an image that fits.

Email banner size at a glance

An email banner is a wide image that runs the full width of an email. The two you’ll use most sit at the top: a header banner with your logo and navigation, and a hero banner right below it that carries the campaign’s main message, often with a headline and a button. Some emails also use smaller banner strips further down, such as a promo bar above the footer.

An email banner displays at 600px wide, with a header banner at 150–200px tall and a hero banner at 300–400px tall. What changes from screen to screen is how big that banner, and the text inside it, looks once a phone shrinks it to fit.

Banner	Design size	2x export	Displays as on a 360px phone	16px text becomes
Header banner	600 × 150–200px	1,200 × 300–400px	~360 × 90–120px	~10px
Hero banner	600 × 300–400px	1,200 × 600–800px	~360 × 180–240px	~10px

On phones, the banner displays at the screen width, roughly 320–480px, so one 600px file covers desktop and mobile. You don’t need to design a separate mobile version. The 2x export is the optional sharpness step from our email image size guide, and for a banner with text on it, it’s the step to keep, because text is the first thing to blur.

What happens if your email banner is too big or too small

A banner that’s too big gets cropped, pushes your message down, or leaves an empty box at the top of the email. A banner that’s too small turns blurry or leaves its text unreadable. Here’s how to spot each problem and fix it.

Too wide: cropped in Outlook, sideways scrolling elsewhere

• What you see: The banner is cut off on the right in classic Outlook for Windows. If the width isn’t set anywhere, other clients show a sideways scroll bar too.
• Why it happens: Classic Outlook renders email with Microsoft Word’s engine, which ignores CSS widths on images. Without a width attribute in the HTML, it displays the image at its actual pixel size, so a 1,200px export shows up at 1,200px
• Fix: Set width=”600″ on the image tag itself. Keep the CSS width too, for every other client.

In SiteGround Email Marketing, the layout’s image block sets the width for you, so there’s no code to edit.

Too tall: your message and CTA drop below the fold

• What you see: A 600 × 800px banner fills a laptop screen before any copy appears. On a phone, it scales to about 360 × 480px, so readers scroll before they know what the email is about.
• Why it happens: The banner takes up the whole first screen, so your headline and CTA start below it.
• Fix: Keep hero banners at 400px tall or less.

Too heavy: slow loading, and a blank space where images are blocked

• What you see: An empty box at the very top of the email, where readers look first.
• Why it happens: A heavy banner takes longer to load, especially on mobile data. The same empty box appears when images are blocked.
• Fix: Give the banner’s cell a background color in your brand palette, add alt text that repeats the headline, and keep the headline in live text below the image.

Text too small once scaled on mobile

• What you see: Banner text that’s hard to read on a phone.
• Why it happens: Text baked into the image shrinks with it. A 600px banner on a 360px phone displays at about 60%, so 16px text drops to around 10px.
• Fix: Set banner headlines at 28px or more at design size (56px in the 1,200px file). On a 360px phone, that lands around 17px, just above the 16px recommended for mobile body text. Better still, move headlines and CTAs into live HTML text, which stays sharp and still shows when images are blocked.
• In SiteGround Email Marketing: Headlines and buttons live in the layout’s sections as HTML text, so they stay readable on phones. You’ll only hit this if you design text into the banner file before you upload it.

Too low-resolution: blurry or pixelated on phone screens

• What you see: A soft banner on high-density phone screens, with the text blurring first.
• Why it happens: The file was exported at exactly 600px, so the phone stretches it to fill extra screen pixels.
• Fix: Export at 1,200px wide and display it at 600px.

How to size your email banner in 4 steps

Sizing an email banner takes four steps: match the template width, export at 2x, keep text in the safe zone, and test.

1. Match the banner to your template width. 

Check your template’s content width before you open a design tool. It’s the one number the rest of your email design builds on.

2. Export at 2x for sharp phone screens.

Set your canvas to 1,200px wide, double the heights from the table, then set width=”600″ on the image. Pick JPG or PNG using the format rules in the image size guide.

3. Keep text and CTAs inside the center safe zone, at a size that survives mobile scaling. 

Leave at least 20px of empty space on each side at design size (40px in the 1,200px file), and keep headlines at 28px or more.

4. Compress the file and test it in real inboxes.

 Get the file under the weight cap from the image size guide, then send a test.

In SiteGround Email Marketing, go to Client Area > Services > Email Marketing > Campaigns and click New Campaign.

• Pick a Basic Layout and click Select. The layout’s image block already holds the right width, so you only need a file that matches it.
• Click the image placeholder and open the Image Gallery. Upload your banner from your computer, or pick one you’ve uploaded before.
• Click Test Email in the top-right corner, enter an address, and click Send. Send one test to each inbox you want to check: Gmail, classic Outlook for Windows, and your phone.
• Open each test and check the banner. First and last name variables show as “Test Name,” so a generic greeting isn’t a bug.

Test your email banner size before every new design

An email banner size that works in one inbox can still break in another, so every new banner gets one test send before it goes to your list. Open it in classic Outlook for the crop, on a phone for the text, and with images turned off for the empty box. 

You don’t have to work out most of this by hand. SiteGround Email Marketing comes with ready-made layouts that have banner placeholders already set to the email’s width and built to scale down on phones.

Pick a layout, click a placeholder to swap in your own banner, and send yourself a test. The width, the structure, and the mobile scaling are already in place, so the only thing left to check is your image.

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Frequently asked questions about email banner size

The right width for every image in a marketing email is 600 to 640 pixels, whether it’s sitting in the header, the hero banner, or the footer. Height and file size change by section, but that width holds the whole layout together. Get it wrong and your image renders stretched, cropped, or oddly scaled, depending on which email client opens it.

Where each image sits in a marketing email

Before we get into the numbers, here’s how a typical marketing email looks and where the images usually go: a header image at the top, a hero banner right under it, one or more body images through the middle, and, where the platform allows it, a footer image near the bottom.

Building in SiteGround Email Marketing skips most of this math for you. Its pre-made templates come with these dimensions already built into each image block. The built-in AI Image Generator creates a replacement image that matches the aspect ratio of whatever’s already sitting in that block, so swapping a placeholder photo doesn’t mean recalculating anything.

The one spec table you need

Bookmark this table instead of piecing the numbers together from five different guides.

Image type	Width	Height	Max file size	Format
Header / logo	600–660px	150–200px	Under 200 KB	PNG (logo) or JPG (photo header)
Hero / banner	600–660px	300–400px	Under 1 MB	JPG (photo) or PNG (graphic)
Body / inline	600–660px	Varies with content	Under 1 MB	JPG (photo) or PNG (icon/graphic)
Footer	600–660px	100–150px	Under 100 KB	PNG (logo/icons)

These numbers are industry convention, not an enforced standard: there’s no W3C spec for email images, and no client checks for compliance. 

The 600px width is the closest thing to a hard rule, since it’s what fits Outlook’s reading pane without a horizontal scrollbar, the same logic behind our email marketing design recommendations for the rest of the template. 

Heights and file-size caps vary somewhat by platform and are shown above as the range most guides converge on.

Header and banner image size

The email header is the first thing a subscriber sees, so it carries the most weight for making a good first impression without slowing anything down.

Recommended width and height

A header image should be 600 to 640px wide and 150 to 200px tall. That height is enough to fit a logo and, sometimes, a short menu bar, without pushing your actual message below the first screen a subscriber sees. Getting this right early in your email format sets a predictable frame for every section below it.

File size cap for header images

Header images should stay under 200 KB, and ideally closer to 100 KB. They’re rarely photographic, so there’s no reason for a logo-and-background header to weigh anywhere near what a hero photo does.

Hero and body image size

This is where most of the email’s visual weight sits, so getting these two right matters more than the header or footer.

Full-width hero images

The hero is the image directly under the header that introduces the campaign’s main idea. It runs 600 to 660px wide and 300 to 400px tall. That range keeps it visible above the fold on both desktop preview panes and mobile screens without forcing a scroll before the offer even registers.

Inline / body images (product shots, inline graphics)

Email body images can go as narrow as 564px, but 600px matches the rest of the template and avoids upscaling on wider screens. An email newsletter that stacks two or three product shots down the body should keep every image at that same width so the layout reads as one column instead of a set of mismatched crops.

File size cap for hero and body images

Cap each hero or body image at 1 MB. That’s the ceiling most email platforms enforce before flagging an upload, and it’s more than enough headroom for a well-compressed photo at 600 to 680px wide.

Footer image size

Most email footers skip images entirely, a logo, social icons, and a background color usually say everything a footer needs to. This section is for the platforms and templates that do add one.

Logo and social icon dimensions

Where a footer image shows up, it’s usually just a small logo (150 to 200px wide) or a row of social icons (24 to 32px each) sitting above the unsubscribe link. SiteGround Email Marketing keeps its footer to links and background color, which covers the same job without needing an image at all.

Keeping footer images lightweight

If a template does include a footer image, keep it light: PNG for logos and icons, under 100 KB total. It’s a small, low-priority element, so it doesn’t need much of the email’s file-size budget. Icons without alt text lose their meaning the moment a client blocks images by default, which is the same reason accessible design treats alt text as mandatory, not optional.

File size limits: How big is too big?

Keep any single image under 1 MB. Most platforms will accept larger files, but a 1 MB image inside an otherwise lightweight email is usually a sign it wasn’t compressed before upload.

There’s one edge case worth knowing about: Gmail cuts off very long emails behind a “View entire message” link once the code behind the email crosses roughly 102 KB. This only matters if you’re writing custom HTML and embedding images directly into the code itself. 

If you’re using an email marketing platform like SiteGround Email Marketing, uploaded images are stored on a server and the email’s code just links to them, so this practically never comes up.

Staying under the 1 MB per-image cap is what actually matters for a typical hosted-image build.

JPG vs. PNG: Which to use where

JPG compresses photographs by discarding detail a viewer won’t notice, trading a little quality for a much smaller file. PNG keeps every pixel intact and supports transparency, which is why it should decide the format, not personal preference.

Format	Compression	Transparency	Best for
JPG	Lossy, smaller file	No	Product shots, hero images, lifestyle photography
PNG	Lossless, larger file	Yes	Logos, icons, text overlays, graphics

A one-off email blast built around a single product photo is a JPG situation every time. A PNG version of the same photo would run two to three times heavier for no visible gain, while a logo saved as JPG loses the transparent background it needs to sit cleanly on a colored section.

Getting email image size right, one time

Once the numbers above are set, header at 600–640px, hero at 200–400px tall, footer under 100 KB, JPG for photos and PNG for everything else, there’s nothing left to guess on the next campaign. Email image size isn’t a creative decision made fresh each send; it’s a spec sheet you set once and reuse.

None of this requires manual calculation if you build the campaign in SiteGround Email Marketing. Its templates arrive with these dimensions already built into each image block, and the AI Image Generator produces a new image that matches the aspect ratio of whatever’s already there, so replacing a placeholder photo doesn’t mean redoing the math above.

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Frequently asked questions about email image size

Marketers keep asking if email marketing is dead. Two things are driving the doubt: attention has drifted to newer platforms, and open rates have looked strange since Apple started auto-loading tracking pixels through Mail Privacy Protection. Email marketing isn’t dead. Email still returns $36 to $42 per dollar spent, ahead of paid search and social ads. The metric that’s broken is open rate, not the channel.

Two questions worth asking first

Two things are doing most of the work behind “is email marketing dead,” and neither one is about the channel itself.

Has attention moved, or have results actually dropped?

TikTok, short-form video, and newer social platforms get talked about constantly. Attention is not the same measurement as return on investment, though. A channel can go quiet in industry conversation while still converting at the same rate it always did. Email marketing metrics have stayed remarkably stable even as the marketing conversation has moved on to louder platforms.

Does a falling open rate mean your campaigns are failing?

For most senders, no. Apple’s Mail Privacy Protection, introduced for Apple Mail users, pre-fetches images and pixels regardless of whether a person actually opens an email. That inflates recorded open rates for a large share of your list, and when the inflation shifts or a spam filter changes, the number moves in ways that have nothing to do with your subject lines or your content.

Both questions lead to the same conclusion: neither reduced attention nor a falling open rate proves email marketing stopped working, only revenue and engagement can answer that. The next section shows what those numbers actually look like.

What the email marketing statistics actually show

Past the open-rate noise, the numbers are consistent: strong ROI, steady click-through rates, a channel performing the way it always has.

Email marketing’s return on investment still leads

Some published estimates put email marketing ROI at $36–$42 returned per dollar spent, a wider margin than paid search or paid social typically deliver on comparable budgets. That gap alone answers the “is it dead” question at the business level: a channel returning that consistently isn’t dying, it’s just not the one everyone is currently talking about.

Channel	Average ROI
Email marketing	$36 to $42 per dollar spent
Paid search (PPC)	About $2 per dollar spent, according to Google Economic Impact Report
Paid social ads	About $3 to $5 per dollar spent, according to Sprout Social

Click-through rate and click-to-open rate are the metrics to trust

Click-through rate typically runs 2% to 5% depending on list warmth and industry, and click-to-open rate, which measures clicks only among people confirmed to have opened, averages closer to 7%. Neither metric depends on the same pixel-loading behavior that Apple Mail Privacy Protection distorts, which makes them a far more honest read on whether your subject lines, content, and offers are actually landing.

Where open rate still fits

Open rate isn’t useless, it’s just no longer a standalone health check. It can still flag a real problem if it drops sharply across your entire list at once, particularly among non-Apple recipients where the inflation doesn’t apply.

Common mistakes that make email marketing look dead

Each of these mistakes creates a real drop in performance, and each one gets misread as proof that the channel stopped working.

Sending to a bloated, unsegmented list

A list full of stale addresses, disengaged subscribers, and people who never wanted the content in the first place drags down your click-through rate, your deliverability, and your sender reputation all at once. It looks like the channel failed. It’s actually list hygiene, one root cause showing up in three different metrics.

For example, a 20,000-contact list with 4,000 people who haven’t opened or clicked in six months will often show a click-through rate under 1%, a bounce rate creeping past 3%, and a slipping sender score as inbox providers pick up on the pattern. If you suppress those 4,000 contacts, the list will often jump to a 2.5%+ click-through rate with bounce rate back under 1%, same content, same audience, just fewer dead names on it. The only thing that changed is who’s still on it.

Tracking the wrong KPI for the goal

If the email marketing goal is revenue or signups but the only number anyone checks is opens, the campaign gets judged against a metric that was never meant to measure that outcome. A campaign can have a mediocre open rate and still hit its revenue target, or a great open rate and convert nobody. Match the metric to the goal, and pick that goal before the campaign goes out, not after.

Treating every email like a one-off blast instead of a strategy

A single promotional email sent to the full list, with no sequence, no segmentation, and no follow-up, will underperform almost any campaign built around a plan. Building an email marketing strategy means defining segments, cadence, and goals before you write a single subject line, and it’s usually the difference between a channel that “stopped working” and one that was never set up to work in the first place.

How to check whether your own email marketing is working

This is the actual gut-check, and it takes less time than most people assume. Start with click-through rate. Then compare your numbers against the table below.

Metric	Healthy range	When to investigate
Click-through rate	Around 1-3% or higher	Trending down across 2-3 sends in a row
Click-to-open rate	Around 8-12% or higher	Dropping while CTR stays flat, or vice versa
Bounce rate	Under 2%	Above 5%, sign of list decay
Spam complaint rate	Under 0.1%	Above 0.3%, most inbox providers start throttling delivery at this point

A quick example. Say your open rate looks strong at 45%, comfortably above what you’d expect for your industry. But your click-through rate is flat at 1.1%, well below healthy. That gap is the tell: a high recorded open rate with weak clicks usually means Apple Mail Privacy Protection is inflating the open number, not that your subject lines are working. The click-through rate is telling you the real story: the content or offer isn’t landing, even though the open rate looks fine.

What to do with what you find:

• CTR and CTOR both healthy, only open rate moved: Leave it alone. This is tracking noise, not a content or strategy problem.
• CTR dropped for two or three sends in a row, CTOR still healthy: The list is fine, the offer or subject lines probably aren’t. Test new subject lines before touching segmentation.
• CTR and CTOR both dropped together: This points to list decay or fatigue. Check your bounce and spam complaint rates next, if those climbed too, it’s time to prune the list, not rewrite the copy.
• Bounce rate or spam complaints climbed on their own, clicks stayed flat: A deliverability problem, not an engagement one. Fix authentication and list hygiene before you touch anything else.

Watching email engagement trends over a few sends, rather than reacting to a single campaign, gives a clearer signal than any one number in isolation.

So is email marketing dead? Not even close.

None of this means email marketing runs itself. List hygiene still matters, segmentation still matters, and picking the right KPI for the goal still matters. What’s changed isn’t the channel’s ability to perform, it’s which metric proves that performance. Open rate stopped being a reliable solo indicator the moment pixel pre-fetching became standard on a large share of inboxes, and marketers who kept watching it alone drew the wrong conclusion.

Platforms built for email marketing that surface click-through rate, click-to-open rate, and deliverability signals side by side make this a lot easier to track than digging through raw export data. SiteGround Email Marketing keeps those numbers visible in one place, so the metric doing the misleading isn’t the one you’re staring at by default.

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Frequently asked questions about whether email marketing is dead

A sudden overnight jump in subscribers isn’t always the good news it looks like. It could be list bombing: bots or bad actors flooding your signup form with fake or non-consenting emails until your bounce rate, spam complaints, and sender reputation take the hit. Before you get excited about the growth chart, check where those signups actually came from. The fix starts with catching the spike.

What list bombing actually is (and how it differs from email bombing)

List bombing is when someone, or something, submits a large volume of fake, invalid, or non-consenting email addresses through your own signup form or checkout page, usually within minutes. The goal is to pollute your list with contacts who never opted in, so your next send trips spam filters and damages your sender reputation.

Email bombing runs in the opposite direction. It takes one real person’s address and subscribes it to hundreds or thousands of unrelated mailing lists at once, burying their inbox in confirmation emails until it’s unusable. If list bombing turns your list into the crime scene, email bombing turns someone else’s inbox into one.

	List bombing	Email bombing
Target	Your email list	Someone else’s inbox
Method	Bots submit fake or invalid addresses to your signup form	Bots subscribe one real address to hundreds of unrelated lists and services
Who gets hurt	You: your sender reputation, deliverability, and contact count	The victim: their inbox becomes unusable
What lands in the inbox	Nothing (the addresses are usually fake)	A flood of confirmation and welcome emails from services the victim never signed up for
Your role	Target	Unwitting accomplice, since your confirmation emails are part of the flood

Subscription bombing is another name for this same email bombing technique. The U.S. Department of Health and Human Services flagged it as a denial-of-service threat in a 2024 sector alert aimed at healthcare organizations, where the goal is usually to bury a legitimate message, like a fraud alert or account sign-in notice, under the noise.

The warning signs you’re being list bombed

Three signals show up together when you’re being list bombed, and none of them show up in isolation during normal list growth.

A subscriber spike with no matching campaign

A normal spike in subscribers can usually be traced to something: a promotion, a piece of content that took off, a signup form placed somewhere new. A list bombing spike has no source. You’ll see 50, 200, or 2,000 new contacts appear within an hour with nothing on your side to explain it: no campaign launch, no partnership, no post that suddenly went viral. Check the timestamps first. Legitimate signups cluster around whatever drove them, like a send time or a social post. Bombed signups cluster around nothing except each other.

A same-second wave of signups from one form

Look at the entry point next. Real subscribers trickle in from different pages, campaigns, and referral sources. A list bombing attack usually funnels through a single unprotected form, often a checkout page or newsletter box, with dozens of submissions landing within the same second or two: the telltale sign of a script rather than a person typing. Names repeat in odd patterns too, the same first and last name over and over, or obvious placeholder text where a real name would go. If your signup form doesn’t already ask for more than an email address, that single field is the door the attack is using.

What list bombing actually looks like: a real case

It didn’t arrive with a label. It happened to SiteGround’s website builder and ecommerce expert Erin Ridley:

“I can’t remember if the warning came from Google or my ESP. All I know is that my emails were all going to spam.”

That’s usually how list bombing shows up first. Not as an alert that names the attack, but as a deliverability problem with no obvious cause. A sender score drops. A domain lands in spam. Nothing on the sending side has changed to explain it.

The cleanup turned out to be the harder part. Without a reliable way to tell the fake signups from the real ones, Erin ended up cutting subscribers who’d done nothing wrong: 

“Cleaning up my list was a total disaster. I had no great way to filter out the fakes and ended up having to delete probably loads of valid emails.”

Over 15,000 bogus signups had been added straight to the list, and in Ridley’s words, that’s “partly why they all bounced too.” The fake addresses didn’t just sit there. They pushed the bounce rate up right alongside the spam complaints, the same two metrics that decide whether a mailbox provider trusts you next time.

Cases like this aren’t rare, and they follow the same shape: fake signups overwhelm the list before anyone’s confirmed the cause, and a routine dashboard check turns into a multi-day cleanup. Nobody sets out looking for this. They notice the number first, which is why monitoring your sender metrics routinely matters more than reacting after the fact.

What list bombing costs you

A list bombing attack hits your sender reputation and sending eligibility on one side, and your bill on the other. Here’s how each one breaks down.

The spam-complaint and bounce-rate thresholds mailbox providers watch

Mailbox providers judge your sender reputation against two numbers, and list bombing pushes both in the wrong direction fast.

• Spam complaint rate: 0.1% (one complaint per 1,000 emails sent). Treated as high across the email marketing industry, and SiteGround Email Marketing uses that same line as the point where a campaign gets suspended.
• Bounce rate: 2%. Fake or invalid addresses created during an attack bounce at a much higher rate than real subscribers, since a chunk of them were never valid inboxes to begin with.

Cross either line and Gmail, Yahoo, and Outlook start routing your legitimate sends to spam right alongside the fake ones.

The real risk: a suspended sending account

The real risk is a stopped campaign.

• Campaign-level suspension. If you’re using SiteGround Email Marketing, a campaign that breaches its bounce or spam-complaint limit gets suspended on the spot.
• Account-level suspension. Repeated or excessive breaches can get your whole Email Marketing service suspended.

A list bombing attack you haven’t caught yet can turn into a paused email program on launch day, with nothing to signal it beforehand except the campaign status changing. Getting reinstated means proving the list is clean first, a slower process than catching the spike before you ever hit send.

What list bombing does to your bill

This part isn’t gated by thresholds at all. Every fake profile that gets even a single confirmation email counts as an active contact for that billing cycle. Some platforms, like SiteGround Email Marketing, price plans by active contact limits rather than total list size, but a flood of bogus signups can still burn through that allowance fast if each one triggers an initial send. SiteGround won’t upgrade your plan automatically, you’ll get a warning and have to raise the limit yourself, and deleting the fake contacts afterward won’t lower that count until the next billing cycle.

How to respond the same day you spot list bombing

Once you’ve confirmed the spike is list bombing and not organic growth, the order of operations matters.

1. Pause sending before you clean anything

Stop any scheduled or automated sends the moment you confirm the spike, even routine ones like welcome emails or order confirmations. Every email sent to a fake or unconfirmed address before the list is clean adds another bounce or complaint to metrics that are already climbing. 

If you’re using SiteGround Email Marketing, check Client Area > Services > Email Marketing > Analytics first: it breaks bounce rate and spam rate down per campaign, so you can see exactly which send the fake signups are hitting before you decide what to pause. 

Say your weekly newsletter always bounces under 1%, and this week it’s at 6%. That jump tells you which campaign to trace back to which list, and from there, which signup form on your site fed that list. A short pause, a day at most, costs you almost nothing. Continuing to send into a bombed list can cost you the sending privileges you’re trying to protect.

2. Segment and suppress the fake profiles

Build a segment around what the fake profiles have in common rather than deleting them one at a time. Where engagement-based filtering is available, signed up in the same 10-minute window, zero opens, zero clicks, no purchase history in 30 days catches most fakes without touching real subscribers.

SiteGround Email Marketing doesn’t support that directly, but tagging the batch with a Custom Field the moment you spot it works as a substitute, then mark that batch as Unsubscribed rather than deleting it outright. Suppressed is a status SiteGround assigns automatically for delivery problems, not one you can apply yourself, so Unsubscribed is the manual equivalent, and it keeps a record of who was excluded and why, which matters if you need to explain an inflated contact count later.

3. Re-enable or tighten double opt-in

Double opt-in is the single change that stops most of this at the form, not after the fact. Instead of adding a submission straight to your active list, it sends a confirmation email first and only activates the contact once a real person clicks it, something a bot filling out a form has no way to do. In SiteGround Email Marketing, the toggle lives at the group level, not the account level: go to Contacts > Groups, open the group tied to the form that got hit, and turn on double opt-in there. Any group you haven’t switched on is still exposed. 

If your form runs through a separate builder like WPForms or Elementor, add it there instead. If you’re on SiteGround’s own form and don’t want to switch builders, an Expert Care request can get CAPTCHA added manually. Either way, treat double opt-in as the default for every group going forward, not just the one that got hit.

Don’t let list bombing catch you off guard again

List bombing isn’t a one-time event for most of the brands it hits. Once a signup form has been targeted, it tends to get targeted again. Bot networks reuse target lists, so the form that got hit once is likely still on one. The forms differ, the volume differs, but the pattern (a spike with no source, clustered timestamps, repeated name patterns) stays the same every time.

SiteGround Email Marketing builds in the two defenses that actually work here. Double opt-in blocks fake signups at the form, and campaign performance monitoring catches a rising bounce or complaint rate before it becomes a suspended campaign. Both are already part of the account, nothing to configure from scratch.

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Frequently asked questions about list bombing

A whitelist gets your domain explicitly trusted. A blacklist and a blocklist do the opposite: they flag you as untrustworthy, and they’re the same mechanism wearing two different names. Which one applies to you right now depends on one question: are you trying to get in, or trying to get delisted?

What’s the actual difference between whitelist, blocklist, and blacklist

A whitelist is a list of senders a mail system trusts by default, so their mail skips normal spam filtering.

A blacklist is a list of senders a mail system flags as untrustworthy, so their mail gets rejected or sent to spam regardless of content.

A blocklist is the same thing as a blacklist, just the newer, more common term for it.

Whitelist and blacklist work on opposite defaults, and that difference is what makes them scale so differently. A whitelist entry only helps the sender it names, for the one recipient system holding it. A blacklist or blocklist affects everyone who checks that list, which is why one listing event on a major list like Spamhaus can hurt delivery across thousands of inboxes at once, while one whitelist entry fixes delivery for exactly one person.

“Blacklist” and “blocklist” are essentially the same list, described with the industry’s older term and its newer one. If a bounce message or a checker tool uses one label instead of the other, that’s not a sign you’re looking at something new, it’s the same problem under a different name. These dynamics all sit inside the bigger picture covered in SiteGround’s email deliverability guide.

Whitelist: What it does and when you need one

Getting whitelisted means one specific mail system has decided to trust you, and that trust doesn’t travel anywhere else.

How email whitelisting actually works

A whitelist runs on allow-by-default logic reversed: nothing gets through unless it’s named. That’s the opposite of how blacklists and blocklists work, where everything gets through unless it’s named. A whitelist entry doesn’t improve your reputation anywhere else; it just tells one specific system to skip its usual filtering for one specific sender.

This is why whitelisting matters most in narrow situations: a client whose finance team needs every invoice email to land, a personal email address that keeps missing a newsletter, an internal system sending automated alerts that can’t afford to be delayed by spam filtering.

How to get your sending domain whitelisted

Four mechanisms actually apply here, and they’re not interchangeable:

• Gmail Postmaster Tools: not a whitelist request tool, but the reputation dashboard Gmail uses to decide whether to trust your domain going forward. Registering your domain and keeping your spam rate below Gmail’s visible threshold is the closest thing to a self-service path toward better placement, since Gmail doesn’t accept manual whitelist requests from senders.
• Microsoft SNDS (Smart Network Data Services): register your sending IP to see Microsoft’s own complaint and filtering data for it. Same “check your standing” logic as Postmaster Tools, for Outlook and Hotmail.
• Microsoft JMRP (Junk Mail Reporting Program): an actual feedback loop, not just a dashboard. Enrolling gets you copies of recipient complaints as they happen, so you can catch a bad segment before it turns into a full listing.
• Asking a specific IT admin directly: the one truly manual request, and it only works after your domain is already authenticated with SPF and DKIM. An admin adding an unauthenticated domain to a mail gateway’s allowlist is asking to get spoofed, so most won’t do it, and shouldn’t.

Where whitelisting falls short

Picture a marketer who asks a key client to add their sending address to Outlook’s Safe Senders list. It works. That one client now always sees the campaign in their inbox. But the next newsletter still lands in spam for the other four thousand subscribers on Gmail and Yahoo, because that whitelist entry only ever applied to one person’s inbox rules. It did nothing for domain or IP reputation anywhere else. Whitelisting is a patch for one relationship, not a fix for your sending reputation.

Blacklist and blocklist: What they do and when they apply to you

“Blacklist” is the older term. “Blocklist” and “denylist” describe the same mechanism. The shift toward the newer terms has been underway across the industry for a few years now, not a change in what actually happens to your mail. If you land on one, your campaigns are either rejected outright or routed straight to spam, and the label used to describe it doesn’t change the outcome.

What actually gets you listed

A short set of triggers accounts for most listings:

• High spam complaint rates
• Hard bounces from a stale list
• Hitting a spam trap
• A sudden, unexplained jump in sending volume

As of 2026, a hard bounce rate over 2% or a spam complaint rate over 0.1% (one complaint per 1,000 emails) puts a domain or IP at risk. Cross 0.3% and you’re looking at serious reputation damage. 

Here’s how that plays out: a small business imports a list of 3,000 contacts they haven’t emailed in two years. Some of those addresses no longer exist. The first campaign alone pushes hard bounces past 2%, and within a day, their IP shows up on Spamhaus. From that point, every email from that IP gets rejected or spam-foldered, including ones going to the addresses that were still perfectly valid. The full breakdown of causes, checking tools, and delisting steps for each major list lives in SiteGround’s guide to email blacklists.

Where blacklisting and blocklisting fall short

Blacklisting and blocklisting have the flip-side problem of whitelisting: these lists permit everything not explicitly named, which means a brand-new spammer with a clean IP sails through until they’ve done enough damage to get flagged. The mechanism is reactive by design. It catches bad behavior after the fact, not before it.

Picture a brand-new sender who buys a “verified” list and sends their first campaign to 10,000 addresses. Nothing’s blocked yet. No spam filter has a reason to distrust an IP with zero sending history. It takes that first bad campaign actually landing, generating complaints and hitting spam traps, before any list catches up to what happened. The mechanism is reactive by design. It catches bad behavior after the fact, not before it.

Which one applies to your situation right now

Term	Default behavior	Who controls it	Where you’ll see it in email	What to do about it
Whitelist	Deny by default, allow named senders	The recipient’s mail system or inbox settings	A client’s Safe Senders list, an internal mail rule	Ask the specific recipient or admin; authenticate first
Blacklist / blocklist	Allow by default, block named senders	Third-party list operators (Spamhaus, Barracuda)	Bounce messages, checker tools like MXToolbox	Confirm the listing, fix the cause, request delisting

If your campaigns are landing in spam or bouncing outright, that’s blacklist and blocklist territory. Start with the checks and removal steps in the email blacklist guide, not with whitelist requests, since asking to be whitelisted while you’re actively flagged treats the symptom, not the cause.

If you’re setting up a new sending domain, or a specific client keeps missing your emails despite otherwise normal deliverability, that’s whitelist territory. If the underlying problem traces back to how your list was built (purchased addresses, no double opt-in, stale subscribers) that’s neither a whitelist nor a blacklist fix. It’s a list hygiene problem wearing a deliverability symptom.

How SiteGround keeps you off these lists in the first place

The whitelist section made SPF and DKIM authentication a prerequisite for any manual allowlist request. SiteGround handles that prerequisite automatically: every domain with SiteGround-managed DNS gets SPF and DKIM set up on signup, no manual records, no support ticket. Domains outside SiteGround DNS get sending blocked until those records exist, so a sender can’t damage their own reputation by skipping authentication.

On the infrastructure side, SiteGround monitors its shared IP pool 24/7 and rotates out any IP that gets flagged, with no visible delivery gap. Every campaign also runs through AI scanning pre-send for spam triggers and phishing patterns, a different layer aimed at the same goal: never end up on a list at all. Paired with clean list-building habits on the sender’s side, that combination is why campaigns sent through SiteGround Email Marketing see a 98.80% delivery rate.

The vocabulary lesson is over. Now let the setup do the work.

SiteGround Email Marketing automatically authenticates any domain pointed to its DNS, and blocks unauthenticated sending from any domain that isn’t, so no sender accidentally torches their own reputation.

Whether you’re launching your first campaign or troubleshooting your five-hundredth, the setup matters more than the vocabulary.

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Frequently asked questions about whitelist vs blacklist vs blocklist

An AI email template generator hands you a fixed layout with placeholder text. An AI email generator writes the real thing on the spot, no placeholders standing in for finished copy. One saves you from designing a layout. The other saves you from staring at a blank subject line field at 4pm on a Friday.

How AI email generators work

An AI email generator writes and designs a complete email from a short prompt: subject line, preheader, and body, drafted specifically for what you’re sending, not filled in from a template. You describe the message, and the tool does the writing; you still decide what it says.

What a generator actually gives you

• You give it a prompt or brief: audience, goal, tone, sometimes a past campaign or product feed as context.
• An LLM drafts the actual send-ready text: subject line, preview text, body copy, and CTA language, generated for that specific message, not pulled from a filler bank.
• Some tools layer in personalization tokens or brand-voice tuning, trained on your past sends, at this stage.
• Layout is often secondary or absent; many generator tools hand you the copy and expect you to drop it into whatever template you already have.

That’s also where SiteGround Email Marketing’s Generate with AI feature has a specific step worth knowing about: describe your business and the email you want, or start from a preset (Promotional, Newsletter, Announcement, Welcome, Event invitation). Then it plays your answers back in a short summary before writing anything, so you can catch a mismatch before you’re looking at a finished draft. Confirm it, and the draft opens straight into the builder you’re already using to edit.

Generation doesn’t have to mean starting from a blank prompt either. Inside a SiteGround Email Marketing template, sparkle icons let you generate a subject line, preheader, image, or block of text on the spot, so a pre-made layout and AI-written copy aren’t mutually exclusive.

Where the human touch still comes in

A finished draft is rarely finished. Brand voice doesn’t come built in, you usually need to feed it sample copy first, and keeping that voice active long-term is often a paid feature.

Personalization works the same way: it needs a real data source behind it, a CRM or your past sends, or the “personalized” line is just a placeholder with a nicer name. That’s exactly why the last pass is yours: a generator hands you a draft, not a finished decision about tone or structure.

None of this replaces email copywriting instinct. A generator hands you a draft, not a finished decision about tone or structure.

How AI email template generators work

Where an AI email generator writes the message, an AI email template generator builds the shell it goes into. 

Give it a prompt, an industry, or a brand asset, and it assembles pre-built blocks, header, hero image, footer, into a structure, then fills the gaps with placeholder text you’re expected to replace yourself. The layout is done. The writing isn’t.

What a template generator actually gives you

• You give it a starting point: a prompt, an industry or use-case selection, or an existing brand asset like a logo or color palette.
• It matches that input against a library of pre-built block layouts (header, hero image, product grid, CTA button, footer) and assembles them into a structure.
• It fills placeholder text and image slots with generic filler copy pulled from the matched category, not copy written for your specific message.
• You then edit that filler manually in a drag-and-drop or block-based editor before sending.

While SiteGround Email Marketing’s templates aren’t AI-assembled, they solve the same starting problem: pick a pre-built layout and skip designing from scratch, then write directly into it with the manual builder.

Where template generators fall short

The layout arrives finished, but the words don’t. If you need five different promotional emails this month, a template generator saves you from rebuilding the structure five times, but you’re still writing five sets of subject lines and body copy from scratch.

That’s the gap an email marketing design process alone doesn’t close. It’s also why “free ai email template generator” and “ai html email template generator” searches usually lead to the same disappointment: a nice-looking shell with nothing written inside it.

AI email template generators vs. AI email generators: which one fits your workflow

	What it does	What it doesn’t	Best for	Example tools
Template generator	Assembles a pre-built layout from blocks	Write your actual message	Recurring formats with a fixed look	Mailmodo, Venngage, Figma plugins
Email generator	Drafts subject line, preheader, and body from a prompt	Guarantee a finished layout	New copy for a specific campaign	SiteGround Email Marketing (Generate with AI)

Ask yourself:

1. Do you need the same layout with new content each time, like a weekly newsletter? A template generator is enough.
2. Does the copy need to change per recipient or campaign? You need an email generator.
3. Does brand voice consistency matter more than speed? Lean template generator; email generator output needs heavier editing.
4. Are you already on a platform with templates built in, like SiteGround Email Marketing? Check what it already covers first. Some platforms, SiteGround Email Marketing included, now generate the copy too, so a separate tool may not be necessary at all.

Worth noting how AI is changing marketing more broadly here: the line between these two categories keeps blurring as more platforms build generation directly into their editors, rather than treating it as a separate product.

When to use an AI email template generator

Reach for a template generator if the layout is what’s actually slowing you down: you’re comfortable writing your own copy, but rebuilding a header, hero image, and footer from scratch every send wastes time you don’t have. This is the more common starting point for anyone new to email marketing, since a working layout is the first thing you need before copy matters at all.

When to use an AI email generator

Reach for an email generator if writing is the bottleneck, not design: you know roughly what the email needs to say, but turning that into a finished subject line and body copy is what eats the afternoon. This is also where it’s worth checking your existing platform before adding another AI tool to your stack, since more email platforms now build generation in directly.

The right AI email generator for your next campaign

Whichever bottleneck you’re solving for, layout or copy, SiteGround Email Marketing covers both without asking you to bring in a separate tool.

Use Generate with AI to build a whole campaign from scratch: describe your business, your audience, and the tone you’re going for, or start from a preset and a complete draft, subject line, preheader, and body, opens straight into the builder. 

Or start from a template and use the sparkle icons within it to generate a subject line, preheader, image, or block of text as you go, without building the whole thing from a prompt.

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Frequently asked questions about AI email template generators

A new domain gets treated as suspicious by mailbox providers before a single email goes out, regardless of how good your content is. Warming up fixes that by building a sending pattern mailbox providers learn to trust over time.

What email warmup does to your sender reputation

A domain builds its reputation through behavior: how much it sends, how consistently, and how recipients respond. A domain with no history that suddenly sends hundreds of messages looks exactly like a spam operation to Gmail, Outlook, or any other provider, even if every word of the content is legitimate. Email warmup is the process of building that pattern deliberately: sending a small, steady volume, growing it over time, and letting real engagement (opens, replies, and clicks) tell providers this domain is worth trusting.

This is why warmup sits downstream of sender reputation rather than replacing it. Reputation is the thing providers are actually scoring. Warmup is how you earn a good one before you need it, instead of finding out you don’t have one the day your first real campaign lands in spam.

How the email warmup ramp works

Warmup works by ramping: gradually increasing how much email you send from a domain while building up engagement signals like opens and replies that mailbox providers read as trust markers. Opens are a weaker signal than they used to be. Apple Mail Privacy Protection can register a false open whether or not someone actually looked at the message, so replies and clicks carry more weight than open rate alone.

Which of the three cases below applies to you comes down to one thing: whether the domain has sent email before, and if it has, whether that sending stopped recently or a long time ago.

If your domain has never sent email before

This is the slowest ramp, and it needs one thing in place before it starts: SPF, DKIM, and DMARC (the records that prove your domain isn’t being spoofed) all confirmed working. Warmup builds trust on top of authentication, not instead of it. Take a domain registered this month for a new product launch, with zero sending history. There’s nothing to lean on here, so the ramp starts at the lowest volume and climbs the most gradually of the three cases.

If you’re warming up a domain you’re migrating

Ramp speed here depends entirely on whether the sending history you’re bringing over was clean. Say a domain is moving from another host, and it was sending consistently with a low bounce rate. That domain can move through warmup faster than the brand-new case, since some trust carries over from the previous sending pattern. It’s not automatic, though. You need to verify that history is clean rather than assume it is.

If you’re reactivating a domain that’s gone quiet

Mailbox providers treat a long gap in sending as a reset, not a pause. A domain that sent regularly two years ago, then went quiet for eight months, doesn’t get to pick up where it left off. 

The ramp for this case follows the same schedule as a brand-new domain, not a lighter version of it, since a gap that long is enough for providers to have stopped trusting the old pattern entirely.

How fast can you actually ramp up?

The schedule below isn’t one formula, and it isn’t always a fixed week count either. New and dormant domains follow the same calendar-based schedule. A migrated domain works differently: how fast it moves depends on its metrics, not the week number.

New domain: 4 to 8 weeks

This is the full week-by-week ramp for a new domain: one that’s never sent email before. Follow it in order, only moving to the next week once the current week’s metrics are healthy.

Week	Emails/day	Focus
1	5-10	Known contacts only, real two-way replies
2	15-25	Keep bounce rate (emails that couldn’t be delivered) at zero
3	30-50	Monitor inbox placement (whether you’re landing in the inbox or spam) closely
4	75-100	Check domain reputation health (your overall trust score with mailbox providers)
5+	+20% per week	Continue only as long as metrics stay healthy

Migrated domain: faster, but only as long as your metrics hold

A migrated domain is one that’s moving its sending to a new host or platform while keeping its existing sending history. This starts one tier higher than the new-domain schedule, since some trust can carry over from that history. It only works as long as your metrics stay within the thresholds below.

Week	Emails/day	Focus
1	20-30	Skip the lowest tier, since some trust carries over. Keep bounce under 2%
2	40-70	Continue only if bounce stays under 2% and complaints (recipients marking you as spam) under 0.1%
3	75-100+	Approaching full volume, same metric gates apply
If either threshold is crossed at any point	—	Drop back to the new-domain schedule instead

If the bounce rate or complaint history on the old domain wasn’t clean, follow the new-domain schedule instead. A migration doesn’t guarantee a faster ramp. It just makes one possible. As a working line: a bounce rate that’s stayed under 2% counts as clean; anything higher and the domain should be treated as if it’s starting from zero.

Dormant domain: same schedule as a new domain

A dormant domain is one that sent email regularly at some point, then stopped for an extended stretch (weeks or months) before picking sending back up. This is the identical schedule as the new-domain table above, not a separate one. A gap in sending is enough to erase the trust a domain had built before, so it starts from the same place.

Week	Emails/day	Focus
1	5-10	Known contacts only, real two-way replies
2	15-25	Keep bounce rate at zero
3	30-50	Monitor inbox placement
4	75-100	Check domain reputation health
5+	+20% per week	Continue only as long as metrics stay healthy

Mailbox providers treat inactivity as a reset. A domain quiet for less than 30 days can often resume closer to its old pace; past 30 days, treat it cautiously; past 60 days, run it as close to the new-domain schedule as this one, since providers no longer have recent data to trust.

Whichever table applies to you, one thing holds across all three: a clean early stretch isn’t permission to skip ahead. Mailbox providers watch the pattern over time, not a single good week, so jumping two tiers because the first few days looked fine tends to undo the progress those days bought you.

Do you need a tool for email warmup?

If you’re warming up one domain, you don’t need to pay for a warmup tool. Free email warmup just means sending to real contacts yourself and tracking replies by hand, and that’s enough for most senders. 

Paid email warmup tools and software exist mainly for agencies or teams juggling several domains at once, where tracking each one manually gets tedious. Those email warmup services automate the tracking, but the underlying schedule doesn’t change. For one domain, doing it yourself is the easier starting point.

Warmup is done. Don’t flip the switch and walk away.

Reputation built during warmup doesn’t hold on its own once the ramp ends. If sending suddenly goes quiet, or jumps straight to full campaign volume the day warmup finishes, the trust you spent weeks building starts eroding immediately. The safer move is to taper into your regular sending pattern, not switch into it.

That’s exactly the kind of ongoing sending SiteGround Email Marketing is built to support once your domain has earned its reputation. Instead of managing the transition manually, you can move straight from a warmed-up domain into scheduled campaigns and automations without a hard cutover moment where your sending pattern changes overnight.

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Frequently asked questions about email warmup

How long does email warmup take?

A brand-new domain typically needs 4 to 8 weeks to reach full sending volume. A migrated domain with a clean history can move faster, but the pace depends on keeping bounce and complaint rates low, not a fixed timeline. A dormant domain coming back into use follows the same schedule as a brand-new one.

What happens if you skip warmup and send at full volume anyway?

Mailbox providers see a sudden spike from a domain with no track record and treat it the same way they’d treat a spam operation. Expect a sharp jump in bounce rate, emails routing straight to spam instead of the inbox, and in worse cases, the domain landing on a blocklist. Recovering from that takes longer than warming up would have in the first place.

Can you warm up more than one domain at once?

Yes, but each domain needs its own separate ramp. Warmup builds reputation per domain, so running two schedules in parallel doesn’t speed either one up, it just means tracking two sets of numbers instead of one. This is the exact situation where manually tracking everything gets tedious, and where the paid tools mentioned earlier tend to earn their cost.

How do you know if warmup is failing?

Watch the same metrics the schedule already tracks: bounce rate climbing past 2%, complaints climbing past 0.1%, or inbox placement dropping instead of holding steady. Any one of those showing up mid-ramp means the volume increased faster than the domain’s reputation could support, and the fix is to hold at the current volume, or drop back a tier, rather than pushing forward.

Can you warm up an email address for free?

Yes. Manual warmup, sending to real contacts who open and reply, costs nothing but the time it takes. Paid tools exist to automate that tracking, but they’re not required to warm up an address.

Does email warmup work the same way with Outlook and Microsoft accounts?

The core mechanism (gradual volume, real engagement) applies across providers, but the specific signals each one weighs, and how quickly each resets trust after inactivity, aren’t identical between Gmail, Outlook, and other providers.