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border-spacing in Gmail Android

Works border-spacing works in Gmail Android.

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 Gmail Android · 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 Gmail iOS?
border-spacing works in Gmail iOS. Closest to Gmail Android: Gmail iOS, which agrees on 273 of the 300 features both are tested on.

To see what in your email Gmail Android 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 · the Gmail capture is not counted (it skips Gmail's sanitiser)