How many email clients support min-width?

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

Does min-width work in Apple Mail?

min-width works in Apple Mail. Closest to Fastmail: Apple Mail, which agrees on 192 of the 235 features both are tested on.

min-width in Fastmail

Works min-width works in Fastmail.

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.

Use a fixed width instead of min-width for Outlook compatibility

instead

2 lines

<!-- Outlook ignores min-width. Use a fixed width or a spacer. -->
<td width="200" style="width: 200px;">Content</td>

Show the original

before

1 line

<td style="min-width: 200px;">Content</td>

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Your next question

Every feature in Fastmail · min-width in every client

Questions

How many email clients support min-width?: It works in 20 of 21, not supported in Outlook Classic.
Does min-width work in Apple Mail?: min-width works in Apple Mail. Closest to Fastmail: Apple Mail, which agrees on 192 of the 235 features both are tested on.

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

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Real captures 14 Oct 2026 on 11 installs · 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