CSS property · 10 real installs 14 Oct 2026 · data last changed 10 Nov 2026
max-width in email clients
Works in 20 of 21. Partial in Outlook Classic.
Your reader in Outlook Classic may not see max-width the way you wrote it, even if it looks right where you tested it.
caniemail (MIT) via @emailens/engine 0.18.22
The fix for Outlook Classic
Use a fixed-width table wrapper for Outlook
<!--[if mso]>
<table role="presentation" width="600" cellpadding="0"
cellspacing="0" border="0" align="center"><tr><td>
<![endif]-->
<div style="max-width: 600px; margin: 0 auto;">
Content here
</div>
<!--[if mso]>
</td></tr></table>
<![endif]-->Show the original
<div style="max-width: 600px; margin: 0 auto;">
Content here
</div>The checker needs a computer screen.
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max-width on 10 real installs
One Emailens probe, screenshotted on each install on 14 October 2026, next to our live preview of the same client. Where max-width is supported you should see: bar stops at 200px.
caniemail: max-width is partly supported in Outlook Classic.
- Outlook 2019 (Windows) · counted as Outlook Classic Real screenshot
- Outlook 2016 (Windows) · counted as Outlook Classic Real screenshot
- Outlook 2007 (Windows) · counted as Outlook Classic Real screenshot
Partial. Only works on <table> elements.
caniemail: max-width works in Outlook 365.
This Outlook.com install drops the <style> in the head, so only inline styles apply.
caniemail: max-width works in Apple Mail.
caniemail: max-width works in Apple Mail iOS.
caniemail: max-width works in Yahoo Mail.
Also captured, not counted as evidence (3)
- Outlook for Microsoft 365 · not mapped to an engine client yet Real screenshot
- Outlook 2019 for Mac (legacy app) · not counted as Outlook for Mac Real screenshot
This is the legacy Outlook for Mac app. The new Outlook for Mac, which the table describes, drops gradients, grid sizing functions, var() and more.
- Gmail (web) · not counted as Gmail Real screenshot
This Gmail install does not apply Gmail's sanitiser, so it shows more than real Gmail does.
Every account includes one free real-device check in classic Outlook, Outlook for Mac and Apple Mail, after you verify your email and run one preview, while this month's free capacity lasts. How real-device checks work →
All 21 clients, problems first
| Client | Support |
|---|---|
| Outlook Classic | Partial See caveat 1 |
Works in 20: Gmail, Gmail Android, Gmail iOS and 17 more. Show all
| Client | Support |
|---|---|
| Gmail | Works |
| Gmail Android | Works |
| Gmail iOS | Works |
| Outlook 365 | Works |
| Outlook (New) | Works |
| Outlook iOS | Works |
| Outlook Android | Works |
| Outlook for Mac | Works |
| Apple Mail | Works |
| Apple Mail iOS | Works |
| Yahoo Mail | Works |
| Yahoo Mail Android | Works |
| Yahoo Mail iOS | Works |
| Samsung Mail | Works |
| Thunderbird | Works |
| HEY Mail | Works |
| Proton Mail | Works |
| AOL Mail | Works |
| Fastmail | Works |
| Superhuman | Works |
Caveats (1)
- 1. Outlook Classic: Partial. Only works on
<table>elements.
Caveats as recorded by caniemail (MIT), one entry per wording.
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fix
max-width in Outlook Classic · Every feature in Outlook Classic · All email CSS features · What real installs show
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