@font-face in Fastmail
Not supported @font-face is not supported in Fastmail.
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 Fastmail sees the email without @font-face, even if it looks right where you tested it.
What to do instead in Fastmail
Add web-safe font fallback stack
/* 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
@font-face {
font-family: 'CustomFont';
src: url('custom.woff2') format('woff2');
}
h1 { font-family: 'CustomFont'; }A free account opens all 21 clients and keeps your checks for 7 days. Create a free account →
What Fastmail does with @font-face
@emailens/engine 0.18.22 on the original code
Fastmail does not support "@font-face".
Your next question
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fix - Does <svg> work in Fastmail?
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fix
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 Fastmail?
- Add web-safe font fallback stack.
- Does @font-face work in Apple Mail?
- @font-face works in Apple Mail. Closest to Fastmail: Apple Mail, which agrees on 192 of the 235 features both are tested on.
To see what else in your email Fastmail does not support, paste the whole email.
No signup · Five clients free, Outlook Classic included · All 21 with an account
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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