CSS function · data last changed 10 Nov 2026
max in email clients
Works in 6 of 21. Not supported in Outlook 365, Outlook (New), Outlook Classic and 8 more. Partial in Gmail Android, Gmail iOS and Samsung Mail. Untested in Superhuman.
Your reader in Outlook Classic sees the email without max, even if it looks right where you tested it.
caniemail (MIT) via @emailens/engine 0.18.22
What to do instead in Outlook Classic
Always supply a literal fallback before max() so Outlook receives a sensible default. Use max() as progressive enhancement layered on top of conservative pixel values.
There is no drop-in fix for max in Outlook Classic. Design so the email still reads without it.
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max is not among the 24 features we have screenshotted on real installs. The ones we have →
All 21 clients, problems first
| Client | Support |
|---|---|
| Outlook 365 | Not supported |
| Outlook (New) | Not supported |
| Outlook Classic | Not supported |
| Outlook iOS | Not supported |
| Outlook Android | Not supported |
| Outlook for Mac | Not supported |
| Yahoo Mail | Not supported |
| Yahoo Mail Android | Not supported |
| Yahoo Mail iOS | Not supported |
| AOL Mail | Not supported |
| Fastmail | Not supported |
| Gmail Android | Partial See caveat 1 |
| Gmail iOS | Partial See caveat 1 |
| Samsung Mail | Partial See caveat 2 |
| Superhuman | Untested |
Works in 6: Gmail, Apple Mail, Apple Mail iOS and 3 more. Show all
| Client | Support |
|---|---|
| Gmail | Works |
| Apple Mail | Works |
| Apple Mail iOS | Works |
| Thunderbird | Works |
| HEY Mail | Works |
| Proton Mail | Works |
Caveats (2)
- 1. Gmail Android, Gmail iOS: Partial. Not supported with non Google accounts.
- 2. Samsung Mail: Partial. Not supported with Microsoft accounts.
Caveats as recorded by caniemail (MIT), one entry per wording.
How max behaves
The max() CSS function returns the largest of a set of values and is used to enforce a minimum. Like min() and calc(), it is a modern function with limited email support, Outlook Classic ignores it, while Apple Mail and modern Gmail honor it.
- Outlook Classic ignores max() and falls back to the previous declaration.
- Apple Mail supports max() across recent macOS and iOS releases.
- max() expressions with mixed units behave inconsistently, prefer same-unit comparisons.
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