How many email clients support max-height?

It works in 20 of 21, not supported in Outlook Classic.

Does max-height work in Apple Mail iOS?

max-height works in Apple Mail iOS. Closest to Apple Mail: Apple Mail iOS, which agrees on 284 of the 298 features both are tested on.

max-height in Apple Mail

Works max-height works in Apple Mail.

Works in 20 of 21 · not supported in 1

Which clients

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

The fix for the clients that need it

Needed in 1 of 21: Outlook Classic.

Outlook ignores max-height; truncate content server-side

instead

5 lines

<!-- Outlook ignores max-height. Truncate content server-side. -->
<div style="height: 200px;">
  Shortened content...
  <a href="https://example.com/full">Read more</a>
</div>

Show the original

before

3 lines

<div style="max-height: 200px; overflow: hidden;">
  Long content...
</div>

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Every feature in Apple Mail · max-height in every client

Questions

How many email clients support max-height?: It works in 20 of 21, not supported in Outlook Classic.
Does max-height work in Apple Mail iOS?: max-height works in Apple Mail iOS. Closest to Apple Mail: Apple Mail iOS, which agrees on 284 of the 298 features both are tested on.

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