border-spacing in Outlook 365
Works border-spacing works in Outlook 365.
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>
</table>A free account opens all 21 clients and keeps your checks for 7 days. Create a free account →
What Outlook 365 does with border-spacing
The Emailens probe for border-spacing on a real install counted as Outlook 365, captured 14 Oct 2026. It shows the probe, not the fix. Where border-spacing is supported it shows: 8px gaps between cells.
caniemail: border-spacing works in Outlook 365.
This Outlook.com install drops the <style> in the head, so only inline styles apply.
Your next question
- Does animation work in Outlook 365?
Works in 5 of 21 · partial in 1 · not supported in 15
fix - Does transform work in Outlook 365?
Works in 7 of 21 · partial in 1 · not supported in 13
fix - Does overflow-wrap work in Outlook 365?
Works in 2 of 21 · partial in 3 · not supported in 13 · 3 untested
fix - Does bimi work in Outlook 365?
Works in 9 of 21 · not supported in 11 · 1 untested
- Does clip-path work in Outlook 365?
Works in 8 of 21 · not supported in 13
- Does block-size work in Outlook 365?
Works in 7 of 21 · not supported in 13 · 1 untested
Every feature in Outlook 365 · 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 Outlook (New)?
- border-spacing works in Outlook (New). Outlook 365 and Outlook (New) differ on 1 feature: text-shadow.
To see what in your email Outlook 365 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