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border-spacing in Yahoo Mail iOS

Works border-spacing works in Yahoo Mail iOS.

Works in 17 of 21 · not supported in 2 · 2 untested

Which clients
Works
Gmail, Gmail Android, Gmail iOS, Outlook 365, Outlook (New), Outlook iOS, Outlook Android, Apple Mail, Apple Mail iOS, Yahoo Mail, Yahoo Mail Android, Yahoo Mail iOS, Samsung Mail, Thunderbird, Proton Mail, AOL Mail, Superhuman
Not supported
Outlook Classic, Outlook for Mac
Untested
HEY Mail, Fastmail

The fix for the clients that need it

Needed in 2 of 21: Outlook Classic and Outlook for Mac.

Use the cellspacing HTML attribute instead of border-spacing CSS

instead 
<table cellspacing="8" style="border-collapse: separate;">
  <tr><td>Cell</td></tr>
</table>
Show the original
before 
<table style="border-spacing: 8px; border-collapse: separate;">
  <tr><td>Cell</td></tr>
</table>

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Your next question

Every feature in Yahoo Mail iOS · border-spacing in every client

Questions

How many email clients support border-spacing?
It works in 17 of 21, not supported in Outlook Classic and Outlook for Mac, 2 untested.
Does border-spacing work in Yahoo Mail Android?
border-spacing works in Yahoo Mail Android. Closest to Yahoo Mail iOS: Yahoo Mail Android, which agrees on 284 of the 297 features both are tested on.

To see what in your email Yahoo Mail iOS does not support, paste the whole email.

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Real captures 14 Oct 2026 on 10 installs · caniemail (MIT) via @emailens/engine 0.18.22 · tested upstream 20 Dec 2023 · data last changed 10 Nov 2026 · Outlook (New) cells are the engine's mapping