How many email clients support @font-face?

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

Does @font-face work in Fastmail?

@font-face is not supported in Fastmail. Closest to HEY Mail: Fastmail, which agrees on 173 of the 235 features both are tested on.

@font-face in HEY Mail

Works @font-face works in HEY Mail.

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

The fix for the clients that need it

Needed in 15 of 21: Gmail, Gmail Android, Gmail iOS and 12 more.

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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Every feature in HEY Mail · @font-face in every client

Questions

How many email clients support @font-face?: It works in 6 of 21, not supported in 15.
Does @font-face work in Fastmail?: @font-face is not supported in Fastmail. Closest to HEY Mail: Fastmail, which agrees on 173 of the 235 features both are tested on.

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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