ProEmailSign
Insights

Field notes from the signature trenches.

Design opinions, render-engine quirks, install gotchas, and the occasional customer war story. Written by the team that ships your signature.

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Why your signature breaks in Outlook (and what we do about it)
Email Clients

Why your signature breaks in Outlook (and what we do about it)

Outlook still uses Microsoft Word as its rendering engine. We explain what that means and the techniques we use to ship signatures that survive it.

Tomás Reyes May 9, 2026 · 7 min
Apple Mail is quietly the strictest email client. Here's why we love it.
Email Clients

Apple Mail is quietly the strictest email client. Here's why we love it.

Apple Mail isn't quirky — it's actually the most standards-compliant. If your signature looks great in Apple Mail, your CSS is probably correct.

Tomás Reyes Apr 2, 2026 · 6 min