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min-height in Proton Mail

Not supported min-height is not supported in Proton Mail.

Works in 19 of 21 · not supported in 2

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, AOL Mail, Fastmail, Superhuman
Not supported
Outlook Classic, Proton Mail

Your reader in Proton Mail sees the email without min-height, even if it looks right where you tested it.

What to do instead in Proton Mail

Use a fixed height or spacer instead of min-height

instead
<!-- Outlook ignores min-height. Use height or a spacer image. -->
<td height="100" style="height: 100px;">Content</td>
Show the original
before
<td style="min-height: 100px;">Content</td>

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Your next question

Every feature in Proton Mail · min-height in every client

Questions

How many email clients support min-height?
It works in 19 of 21, not supported in Outlook Classic and Proton Mail.
What do I use instead of min-height in Proton Mail?
Use a fixed height or spacer instead of min-height.
Does min-height work in Apple Mail?
min-height works in Apple Mail. Closest to Proton Mail: Apple Mail, which agrees on 203 of the 300 features both are tested on.

To see what else in your email Proton Mail does not support, paste the whole email.

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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