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linear-gradient in Fastmail

Works linear-gradient works in Fastmail.

Works in 9 of 21 · partial in 2 · not supported in 10

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

The fix for the clients that need it

Needed in 12 of 21: Outlook 365, Outlook (New), Outlook Classic and 9 more.

Add solid color fallback for gradient backgrounds

instead 
<td style="background-color: #667eea;
            background-image: linear-gradient(135deg, #667eea, #764ba2);
            padding: 40px; color: #fff;">
  Content here
</td>
Show the original
before 
<td style="background: linear-gradient(135deg, #667eea, #764ba2);
            padding: 40px; color: #fff;">
  Content here
</td>

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Your next question

Every feature in Fastmail · linear-gradient in every client

Questions

How many email clients support linear-gradient?
It works in 9 of 21, partial in 2, not supported in 10.
Does linear-gradient work in Apple Mail?
linear-gradient works in Apple Mail. Closest to Fastmail: Apple Mail, which agrees on 192 of the 235 features both are tested on.

To see what in your email Fastmail does not support, paste the whole email.

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Real captures 14 Oct 2026 on 10 installs · caniemail (MIT) via @emailens/engine 0.18.22 · tested upstream 29 Dec 2021 · data last changed 10 Nov 2026 · Outlook (New) cells are the engine's mapping