Skip to main content

Our email CSS engine is open source. Give it a star on GitHub 

Emailens
Sign in

word-break in Yahoo Mail

Not supported word-break is not supported in Yahoo Mail.

Works in 4 of 21 · partial in 12 · not supported in 5

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

Your reader in Yahoo Mail sees the email without word-break, even if it looks right where you tested it.

The fix for Yahoo Mail

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

after 
<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 
<span style="word-break: break-all;">
  https://example.com/very/long/url?token=abc123def456
</span>

The checker needs a computer screen.

A free account opens all 21 clients and keeps your checks for 7 days. Create a free account →

What Yahoo Mail does with word-break

The Emailens probe for word-break on a real install counted as Yahoo Mail, captured 14 Oct 2026. It shows the problem, not the fix. Where word-break is supported it shows: long word wraps inside the box.

Yahoo Mail

caniemail: word-break is not supported in Yahoo Mail.

Emailens live preview of Yahoo Mail Our live preview The same probe in the Emailens live preview of Yahoo Mail

@emailens/engine 0.18.22 on the original code

Yahoo Mail does not support "word-break".

Your next question

Every feature in Yahoo Mail · word-break in every client

Questions

How many email clients support word-break?
It works in 4 of 21, partial in 12, not supported in 5.
What do I use instead of word-break in Yahoo Mail?
Outlook Windows does not wrap a URL on word-break, word-wrap, or overflow-wrap. Insert &#8203; in a cell that has a width.
Does word-break work in Yahoo Mail iOS?
word-break is not supported in Yahoo Mail iOS. Closest to Yahoo Mail: Yahoo Mail iOS, which agrees on 282 of the 298 features both are tested on.

To see what else in your email Yahoo Mail does not support, paste the whole email.

The checker needs a computer screen.

Real captures 14 Oct 2026 on 10 installs · caniemail (MIT) via @emailens/engine 0.18.22 · tested upstream 15 Feb 2022 · data last changed 10 Nov 2026 · Outlook (New) cells are the engine's mapping