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gap in Outlook 365

Partial gap is partly supported in Outlook 365.

Supports column-gap for flexbox.

Works in 7 of 21 · partial in 9 · not supported in 5

Which clients
Works
Apple Mail, Apple Mail iOS, Samsung Mail, Thunderbird, HEY Mail, Proton Mail, Superhuman
Partial
Gmail, Gmail Android, Gmail iOS, Outlook 365, Outlook (New), Outlook iOS, Outlook Android, Outlook for Mac, Fastmail
Not supported
Outlook Classic, Yahoo Mail, Yahoo Mail Android, Yahoo Mail iOS, AOL Mail

Your reader in Outlook 365 may not see gap the way you wrote it, even if it looks right where you tested it.

What to do instead in Outlook 365

Use padding or margin on child elements instead of gap

instead
<table role="presentation" cellpadding="0"
  cellspacing="0" border="0">
  <tr>
    <td style="padding-right: 16px;">Item 1</td>
    <td style="padding-right: 16px;">Item 2</td>
    <td>Item 3</td>
  </tr>
</table>
Show the original
before
<div style="display: flex; gap: 16px;">
  <div>Item 1</div>
  <div>Item 2</div>
  <div>Item 3</div>
</div>

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What Outlook 365 does with gap

caniemail record, tested upstream 28 Dec 2022

  • Partial. Supports column-gap for flexbox.

Your next question

Every feature in Outlook 365 · gap in every client

Questions

How many email clients support gap?
It works in 7 of 21, partial in 9, not supported in 5.
What do I use instead of gap in Outlook 365?
Use padding or margin on child elements instead of gap.
Does gap work in Outlook (New)?
gap is partly supported in Outlook (New). Outlook 365 and Outlook (New) differ on 1 feature: text-shadow.

To see what else in your email Outlook 365 does not support, paste the whole email.

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caniemail (MIT) via @emailens/engine 0.18.22 · tested upstream 28 Dec 2022 · data last changed 10 Nov 2026 · Outlook (New) cells are the engine's mapping