CSS property · data last changed 10 Nov 2026

overflow-wrap in email clients

Works in 2 of 21. Not supported in Gmail, Gmail Android, Gmail iOS and 10 more. Partial in Apple Mail, Apple Mail iOS and Proton Mail. Untested in Thunderbird, HEY Mail and Fastmail.

Your reader in Outlook Classic sees the email without overflow-wrap, even if it looks right where you tested it.

caniemail (MIT) via @emailens/engine 0.18.22

The fix for Outlook Classic

Outlook Windows does not wrap a URL on word-break, word-wrap, or overflow-wrap. Insert  in a cell that has a width

after

8 lines

<table role="presentation" width="100%" cellpadding="0"
  cellspacing="0" border="0">
  <tr>
    <td width="100%">
      https://example.com/&#8203;very/&#8203;long/&#8203;url?token=&#8203;abc123def456
    </td>
  </tr>
</table>

Show the original

before

3 lines

<p style="overflow-wrap: break-word;">
  https://example.com/very/long/url?token=abc123def456
</p>

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overflow-wrap is not among the 24 features we have screenshotted on real installs. The ones we have →

All 21 clients, problems first

Client	Support
Gmail	Not supported
Gmail Android	Not supported
Gmail iOS	Not supported
Outlook 365	Not supported
Outlook (New)	Not supported
Outlook Classic	Not supported ^{See caveat 1}
Outlook iOS	Not supported
Outlook Android	Not supported
Outlook for Mac	Not supported
Yahoo Mail	Not supported
Yahoo Mail Android	Not supported
Yahoo Mail iOS	Not supported
AOL Mail	Not supported
Apple Mail	Partial ^{See caveat 2}
Apple Mail iOS	Partial ^{See caveat 2}
Proton Mail	Partial ^{See caveat 3}
Thunderbird	Untested
HEY Mail	Untested
Fastmail	Untested
Samsung Mail	Works
Superhuman	Works

Caveats (3)

1. Outlook Classic: Does not honor any wrapping, including word-wrap, overflow-wrap, and word-break. Using an equivalent MSO breakdown (-ms-word-break: break-all and mso-hyphenate: none together) does not work.
2. Apple Mail, Apple Mail iOS: Buggy. Requires word-break:normal to reset Apple Mail default style (See issue#394.)
3. Proton Mail: word-wrap is correctly supported, however word-break seems to break for all values

Caveats as recorded by caniemail (MIT), one entry per wording.

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overflow-wrap in Outlook Classic · Every feature in Outlook Classic · All email CSS features · What real installs show

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