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@font-face in Outlook (New)

Not supported @font-face is not supported in Outlook (New).

Works in 6 of 21 · not supported in 15

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

Your reader in Outlook (New) sees the email without @font-face, even if it looks right where you tested it.

What to do instead in Outlook (New)

Add web-safe font fallback stack

instead 
/* Keep @font-face for clients that support it */
@font-face {
  font-family: 'CustomFont';
  src: url('custom.woff2') format('woff2');
}
h1 {
  font-family: 'CustomFont', Arial, Helvetica, sans-serif;
}
Show the original
before 
@font-face {
  font-family: 'CustomFont';
  src: url('custom.woff2') format('woff2');
}
h1 { font-family: 'CustomFont'; }

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What Outlook (New) does with @font-face

@emailens/engine 0.18.22 on the original code

Outlook (New) does not support "@font-face".

Your next question

Every feature in Outlook (New) · @font-face in every client

Questions

How many email clients support @font-face?
It works in 6 of 21, not supported in 15.
What do I use instead of @font-face in Outlook (New)?
Add web-safe font fallback stack.
Does @font-face work in Outlook 365?
@font-face is not supported in Outlook 365. Outlook (New) and Outlook 365 differ on 1 feature: text-shadow.

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

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caniemail (MIT) via @emailens/engine 0.18.22 · tested upstream 19 Dec 2023 · data last changed 10 Nov 2026 · Outlook (New) cells are the engine's mapping