<link> in Fastmail
Not supported <link> is not supported in Fastmail.
Works in 3 of 21 · not supported in 18
Which clients
- Works
- Outlook Classic, Apple Mail, Apple Mail iOS
- Not supported
- Gmail, Gmail Android, Gmail iOS, Outlook 365, Outlook (New), Outlook iOS, Outlook Android, Outlook for Mac, Yahoo Mail, Yahoo Mail Android, Yahoo Mail iOS, Samsung Mail, Thunderbird, HEY Mail, Proton Mail, AOL Mail, Fastmail, Superhuman
Your reader in Fastmail sees the email without <link>, even if it looks right where you tested it.
The fix for Fastmail
Inline all CSS instead of using external stylesheets
<div style="max-width: 600px; margin: 0 auto;">
<div style="background-color: #6d28d9; padding: 32px;"></div>
</div>Show the original
<head>
<link rel="stylesheet" href="styles.css" />
</head>The checker needs a computer screen.
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What Fastmail does with <link>
@emailens/engine 0.18.22 on the original code
Fastmail does not support external stylesheets.
Your next question
- Does <form> work in Fastmail?
Works in 10 of 21 · partial in 4 · not supported in 7
fix - Does <svg> work in Fastmail?
Works in 5 of 21 · partial in 1 · not supported in 15
fix - Does <video> work in Fastmail?
Works in 3 of 21 · partial in 2 · not supported in 16
fix - Does <marquee> work in Fastmail?
Works in 8 of 21 · partial in 6 · not supported in 6 · 1 untested
- Does <body> work in Fastmail?
Works in 5 of 21 · partial in 9 · not supported in 6 · 1 untested
- Does <dialog> work in Fastmail?
Works in 5 of 21 · not supported in 15 · 1 untested
Questions
- How many email clients support <link>?
- It works in 3 of 21, not supported in 18.
- What do I use instead of <link> in Fastmail?
- Inline all CSS instead of using external stylesheets.
- Does <link> work in Apple Mail?
- <link> 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
The checker needs a computer screen.
caniemail (MIT) via @emailens/engine 0.18.22 · tested upstream 21 Dec 2023 · data last changed 10 Nov 2026 · Outlook (New) cells are the engine's mapping