Errors in email campaigns happen even to experienced teams: broken links, broken images, typos, incorrect UTM tags. And all of this can cost you your reputation or money. In this article, we'll show you how to quickly and effectively check an email before sending it, so everything works perfectly.

Why checking matters

✔ An error in the campaign → lost trust.✔ A broken link → lost sales.✔ An email that doesn't open on mobile → lost audience.

That's why checking is a mandatory step in any email marketing process.

Step 1. Check the links

  • Are all links clickable?
  • Are there any empty links (href="#")?
  • Are all UTM tags in place?
  • Do the links lead to the correct pages?

Tip: go through all the buttons and text links manually in the preview.

Step 2. Check the images

  • Do the images display and load quickly?
  • Do the images have alt text (alternative captions)?
  • Does the total email size stay under ~100–150 KB?

Tip: Letteros has image optimization — don't forget to use it.

Step 3. Check the text

  • Are there any typos or errors?
  • Does the text read easily, without overly complex constructions?
  • Does the tone and style fit your audience?

Tip: have at least one colleague read the email — a fresh perspective helps.

Step 4. Check the display across devices

  • Does everything look right on desktop?
  • Does everything look right on mobile?
  • Does the email display correctly in popular clients (Gmail, Outlook, Apple Mail)?

Letteros has built-in testing that shows how the layout looks on different screens.

Step 5. Check the send settings

  • Is the correct sender specified (name, address)?
  • Are the subject line and preheader filled in?
  • Is the correct recipient group selected?

Tip: send a test email to several personal addresses (Gmail, Yandex, Outlook) to see how it arrives «in the wild».

Quick checklist

✔ Links work✔ Images display✔ Text is error-free✔ Mobile-adapted✔ Correct send settings✔ Tested on personal email

Conclusion

Even if you're preparing 10 campaigns a day, checking is a mandatory step. With Letteros, you can do this quickly: the editor has a preview, link checking, image optimization, and test sends.