border-spacing in Thunderbird
Works border-spacing works in Thunderbird.
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
<table cellspacing="8" style="border-collapse: separate;">
<tr><td>Cell</td></tr>
</table>Show the original
<table style="border-spacing: 8px; border-collapse: separate;">
<tr><td>Cell</td></tr>
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fix
Every feature in Thunderbird · 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 Apple Mail?
- border-spacing works in Apple Mail. Closest to Thunderbird: Apple Mail, which agrees on 219 of the 261 features both are tested on.
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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