You've put time, money, and ideas into a campaign, and conversions are still low?The problem might not be the offer or the price, but the email's design itself.In this article, we'll cover the most common mistakes — and how to fix them so your emails finally start selling.
Mistake 1. Too many elements
❌ Banners, buttons, GIFs, images, text, headers, footer — all crammed into one email.Why it's bad: attention gets scattered, and the reader doesn't understand what matters most.
✅ How to fix it: make one email → one focus. One main goal, one CTA.
Mistake 2. Weak visual hierarchy
❌ Text, headings, and buttons all the same size.Why it's bad: the email turns into a "wall of text," with nothing for the eye to latch onto.
✅ How to fix it: make important things bigger, use contrast, and place emphasis correctly.
Mistake 3. Small buttons and links
❌ 10×10 px buttons, links you can't tap accurately on a phone.Why it's bad: users can't click, and conversion is lost.
✅ How to fix it: make buttons at least 44×44 px, and use large, high-contrast CTAs.
Mistake 4. Poor text readability
❌ Gray text on a gray background, text that's too small, non-standard fonts with no fallback.Why it's bad: the text blends into the background and becomes hard to read.
✅ How to fix it: use high contrast, web-safe fonts, and a text size no smaller than 14 px.
Mistake 5. Overloaded banners
❌ A banner crammed with tons of text and tiny details.Why it's bad: banners are hard to read on mobile, and text inside images isn't indexed.
✅ How to fix it: use the banner purely as a visual accent — the main information should live in text blocks.
Mistake 6. No responsiveness
❌ The email falls apart on mobile, columns don't rearrange, elements overlap.Why it's bad: most subscribers read email on their phone — if the email is inconvenient, they'll just close it.
✅ How to fix it: use responsive blocks and check the preview.
Mistake 7. An email that's too heavy
❌ The email's total weight (especially due to images and GIFs) exceeds 150–200 KB.Why it's bad: the email loads slowly and might not fully open.
✅ How to fix it: optimize images and don't overdo it with GIFs.
Mistake 8. No clear CTA
❌ "Well, we'll tell you something...", "well, we'll offer you something..." — but no clear call to action.Why it's bad: the user doesn't understand what you want from them and just closes the email.
✅ How to fix it: a clear, noticeable, unambiguous CTA (one, at most two).
Conclusion
These 8 mistakes are the classic conversion killers in email campaigns.The good news: you can fix them quickly, especially if you work in Letteros — it already has ready-made, safe blocks and templates built in.