Every email marketer has a story about the send they wish they could take back: the broken link, the wrong name, the offer that expired yesterday, the email that went to the wrong list. These mistakes are embarrassing, but they are almost never bad luck. They are the result of sending without a checklist. A pre-send check takes ten to fifteen minutes, and it catches nearly every error that makes a campaign fail, because most errors are small, visible, and entirely preventable — if someone looks. This guide gives you that checklist, in the order to run it.
Start With the Basics: List, Sender, and Subject
Before you look at the design, confirm the foundations. First, the list: is this the right audience, and only this audience? Sending a loyal-customer offer to your entire list, or a beginner guide to advanced buyers, is the most common targeting mistake, and it is invisible once the email is gone. Check the segment name, subscriber count, and exclusions — people who already bought or already received this offer. Second, the sender name and reply address: does the sender name read as a person or a brand your readers recognise, and does the reply address accept replies? A no-reply address tells readers you do not want to hear from them, and it hurts deliverability too. Third, the subject line and preview text: read them together, exactly as they will appear on a phone, and check for typos, accidental placeholders, and misleading promises. A subject promising a discount the email does not contain is a complaint waiting to happen. Our guide to subject lines that get opened covers writing them well; the checklist step is simply to read what you actually wrote, out loud, before anyone else does. Finally, confirm send time and time zone: a “today only” offer sent late is already broken.
Proofread Like a Reader, Not the Author
You cannot proofread your own writing reliably, because your brain reads what you meant, not what you wrote. Build proofreading into the checklist as a separate step, done by a different person when possible, or by you after a break when not. Read the email from top to bottom as a subscriber would: headline, body, call to action, footer. Check every name, date, price, and claim against its source, because numbers are where errors hide and where readers notice them first. Check personalisation fields: send a test to a profile with a missing first name and one with an unusual name, and confirm both render sensibly. Check offer terms — expiry, eligibility, exclusions, code — against the landing page exactly. An email promising one thing and a page saying another destroys trust. Read the footer too: unsubscribe link present and working, physical address correct, and any legal text your region requires. Proofreading costs minutes; a mistake costs a campaign.
Test Every Link, Button, and Image
Links are the part of an email most likely to be broken and least likely to be checked. Click every single one in a test send: the main call to action, secondary links, social icons, the unsubscribe link, the view-in-browser link, and any image that is also a link. Confirm each lands on the right page, that the page loads, and that any discount code or tracking parameter survived the journey. Watch links copied from earlier campaigns: old tracking codes, previous offers, and sold-out products are classic copy-paste errors. Check buttons separately from links, because a button can look right while pointing nowhere, especially after a template change. Then check images: do they load, do they have descriptive alt text for readers with images blocked, and does the email still make sense with images off? A message that is incomprehensible without images will lose a large share of readers. Keep total image size reasonable so the email loads quickly on mobile data, and confirm the logo and key visuals are crisp, not stretched or pixelated. If the email carries an interactive element such as a poll or a timer, click that too, in every inbox you test, and confirm the fallback works where the interactive version does not. A link check takes five minutes. A broken main call to action wastes the entire campaign.
Check Rendering Across Inboxes and Devices
Email does not render the same everywhere. What looks perfect in one inbox can break in another: columns stack wrong, fonts fall back, buttons change shape, spacing collapses. Test the inboxes your readers actually use — your email tool’s reports will name them, usually a handful of major providers plus mobile apps. Send a test to yourself and open it on a phone and a desktop, in at least two different inboxes, with images on and off. Look for the common failures: text overflowing its container, buttons too small to tap on mobile, headlines wrapping badly, background colours disappearing, and the layout breaking at narrow widths. Check dark mode too: some inboxes invert colours, which can turn dark text on dark backgrounds invisible. If your email tool offers a rendering preview across inboxes, use it for important campaigns, but never treat a preview as a substitute for opening a real test email yourself. Preview tools approximate; a real inbox decides. For design standards worth checking against, our guide to email design best practices covers the layout and mobile rules that prevent most rendering problems before they start. Fix what you find, re-test, and only then schedule the send.
Deliverability and Compliance: The Checks That Protect Your List
A beautiful email that lands in spam, or that breaks the law, helps no one. Run the deliverability checks before every important send. Confirm the sending domain is authenticated and nothing changed since your last successful send, such as a domain or tool migration. Check your content for common spam triggers: excessive capital letters, misleading subject lines, image-only emails with almost no text, and link shorteners that hide the destination. Keep the text-to-image balance healthy and the language honest. Then run the compliance checks: every marketing email must carry a working unsubscribe mechanism that is honoured promptly, a valid sender address, and an accurate subject line. If you mail readers in regions with strict privacy law, confirm consent records are in place for the segment you are mailing. If the email collects replies or data, confirm the privacy notice covers it. These checks connect directly to your long-term deliverability, covered in our guide to email deliverability: one careless campaign can raise complaints and hurt the inbox placement of the next ten. Finally, check suppression: unsubscribes, bounces, and spam complaints from previous sends must be excluded automatically. If your tool does not do this reliably, stop and fix that before sending anything else.
The Final Five Minutes: Test Send and Approval
The last step is a full test send to a small internal list, treated as if it were the real campaign. Include at least one person who was not involved in writing the email, because fresh eyes catch what tired ones miss. Each tester checks one thing: one reads for typos, one clicks every link, one opens on mobile, one checks the offer against the landing page. Fix corrections, then send one more test: a corrected link can easily introduce a new error. Meanwhile, confirm the campaign settings: correct list, send time, time zone, and no leftover test segment. If your tool supports send-time optimisation or staggered sending, confirm those settings match your intent rather than a previous campaign’s defaults. Then get explicit approval from whoever owns the campaign, even if that is just you saying “send” out loud after the checklist is complete. Never schedule and walk away: open the scheduled item, read its summary, and confirm it is the version you tested. Scheduling the wrong draft causes more disasters than anyone admits. Once approval is given, send — and watch the first hour’s numbers for bounces, complaints, and replies, so a problem caught early can still be contained.
Frequently Asked Questions
How long should a pre-send check take?
Ten to fifteen minutes for a standard campaign, longer for a major launch or a complex email with many links and segments. That time is trivial against the cost of a broken send, and most of it is clicking links and reading the test email, not paperwork.
What is the most common pre-send mistake?
Clicking nothing. The majority of failed campaigns involve a broken main link, a wrong segment, or a leftover placeholder, all of which a single test send would have caught. If you check one thing, check the email as a subscriber receives it: open the test, click the button, land on the page.
Should I use a different person to proofread?
Yes, whenever possible. A second reader catches errors the author is blind to, especially placeholders, wrong names, and offer mismatches. If you work alone, take a break before proofreading, read the email out loud, and check personalisation with test profiles that have missing or unusual data.
Conclusion
A pre-send checklist is not extra work; it is the work that makes all your other work count. Confirm the list and sender, proofread as a reader, click every link, check rendering on real devices, run the deliverability and compliance checks, and finish with a test send and explicit approval. Ten minutes, every time, without exception. The campaigns that fail are rarely the ones with bad ideas; they are the ones with good ideas sent broken. Build the checklist, use it on every send, and let it quietly protect your reputation, your list, and every result your emails were meant to earn.