border-spacing in Outlook Classic
Not supported border-spacing is not supported in Outlook Classic.
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 Classic sees the email without border-spacing, even if it looks right where you tested it.
The fix for Outlook Classic
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 Classic does with border-spacing
The Emailens probe for border-spacing on 3 real installs counted as Outlook Classic, captured 14 Oct 2026. It shows the problem, not the fix. Where border-spacing is supported it shows: 8px gaps between cells.
caniemail: border-spacing is not supported in Outlook Classic.
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@emailens/engine 0.18.22 on the original code
Outlook Classic does not support "border-spacing".
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fix
Every feature in Outlook Classic · 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 Classic?
- Use the cellspacing HTML attribute instead of border-spacing CSS.
- Does border-spacing work in AOL Mail?
- border-spacing works in AOL Mail. Closest to Outlook Classic: AOL Mail, which agrees on 206 of the 298 features both are tested on.
To see what else in your email Outlook Classic does not support, paste the whole email.
No signup · Five clients free, Outlook Classic included · All 21 with an account
The checker needs a computer screen.
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