How many email clients support ?

It works in 3 of 21, not supported in 18.

Does work in AOL Mail?

is not supported in AOL Mail. Closest to Outlook Classic: AOL Mail, which agrees on 206 of the 298 features both are tested on.

<link> in Outlook Classic

Works <link> works in Outlook Classic.

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

The fix for the clients that need it

Needed in 18 of 21: Gmail, Gmail Android, Gmail iOS and 15 more.

Inline all CSS instead of using external stylesheets

instead

3 lines

<div style="max-width: 600px; margin: 0 auto;">
  <div style="background-color: #6d28d9; padding: 32px;"></div>
</div>

Show the original

before

3 lines

<head>
  <link rel="stylesheet" href="styles.css" />
</head>

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

Questions

How many email clients support <link>?: It works in 3 of 21, not supported in 18.
Does <link> work in AOL Mail?: <link> is not supported in AOL Mail. Closest to Outlook Classic: AOL Mail, which agrees on 206 of the 298 features both are tested on.

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

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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