How many email clients support @font-face?

It works in 6 of 21, not supported in 15.

Does @font-face work in Outlook (New)?

@font-face is not supported in Outlook (New). Closest to Outlook for Mac: Outlook (New), which agrees on 279 of the 299 features both are tested on.

@font-face in Outlook for Mac

Not supported @font-face is not supported in Outlook for Mac.

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 for Mac sees the email without @font-face, even if it looks right where you tested it.

What to do instead in Outlook for Mac

Add web-safe font fallback stack

instead

8 lines

/* 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

5 lines

@font-face {
  font-family: 'CustomFont';
  src: url('custom.woff2') format('woff2');
}
h1 { font-family: 'CustomFont'; }

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What Outlook for Mac does with @font-face

@emailens/engine 0.18.22 on the original code

Outlook for Mac does not support "@font-face".

Your next question

Every feature in Outlook for Mac · @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 for Mac?: Add web-safe font fallback stack.
Does @font-face work in Outlook (New)?: @font-face is not supported in Outlook (New). Closest to Outlook for Mac: Outlook (New), which agrees on 279 of the 299 features both are tested on.

To see what else in your email Outlook for Mac 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