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<link> in Outlook iOS

Not supported <link> is not supported in Outlook iOS.

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 Outlook iOS sees the email without <link>, even if it looks right where you tested it.

The fix for Outlook iOS

Inline all CSS instead of using external stylesheets

after 
<div style="max-width: 600px; margin: 0 auto;">
  <div style="background-color: #6d28d9; padding: 32px;"></div>
</div>
Show the original
before 
<head>
  <link rel="stylesheet" href="styles.css" />
</head>

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What Outlook iOS does with <link>

@emailens/engine 0.18.22 on the original code

Outlook iOS does not support external stylesheets.

Your next question

Every feature in Outlook iOS · <link> in every client

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 Outlook iOS?
Inline all CSS instead of using external stylesheets.
Does <link> work in Outlook Android?
<link> is not supported in Outlook Android. Closest to Outlook iOS: Outlook Android, which agrees on 270 of the 296 features both are tested on.

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

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