border-spacing in Outlook for Mac
Not supported border-spacing is not supported in Outlook for Mac.
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
Your reader in Outlook for Mac sees the email without border-spacing, even if it looks right where you tested it.
The fix for 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>
</table>The checker needs a computer screen.
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What Outlook for Mac does with border-spacing
@emailens/engine 0.18.22 on the original code
Outlook for Mac does not support "border-spacing".
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Every feature in Outlook for Mac · 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.
- What do I use instead of border-spacing in Outlook for Mac?
- Use the cellspacing HTML attribute instead of border-spacing CSS.
- Does border-spacing work in Outlook (New)?
- border-spacing works in Outlook (New). Closest to Outlook for Mac: Outlook (New), which agrees on 279 of the 299 features both are tested on.
To see what else in your email Outlook for Mac 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