Skip to main content

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

Emailens
Sign in

@font-face in Outlook 365

Not supported @font-face is not supported in Outlook 365.

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

What to do instead in Outlook 365

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'; }

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

What Outlook 365 does with @font-face

@emailens/engine 0.18.22 on the original code

Outlook 365 does not support "@font-face".

Your next question

Every feature in Outlook 365 · @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 365?
Add web-safe font fallback stack.
Does @font-face work in Outlook (New)?
@font-face is not supported in Outlook (New). Outlook 365 and Outlook (New) differ on 1 feature: text-shadow.

To see what else in your email Outlook 365 does not support, paste the whole email.

The checker needs a computer screen.

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