CSS property · data last changed 10 Nov 2026
text-underline-position in email clients
Works in 8 of 21. Not supported in Outlook Classic, Outlook for Mac, Yahoo Mail and 3 more. Partial in Gmail iOS, Outlook iOS, Apple Mail and 1 more. Untested in HEY Mail, Fastmail and Superhuman.
Your reader in Outlook Classic sees the email without text-underline-position, even if it looks right where you tested it.
caniemail (MIT) via @emailens/engine 0.18.22
What to do instead in Outlook Classic
There is no drop-in fix for text-underline-position in Outlook Classic. Design so the email still reads without it.
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text-underline-position is not among the 24 features we have screenshotted on real installs. The ones we have →
All 21 clients, problems first
| Client | Support |
|---|---|
| Outlook Classic | 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 |
| Gmail iOS | Partial See caveat 1 |
| Outlook iOS | Partial See caveat 1 |
| Apple Mail | Partial See caveat 1 |
| Apple Mail iOS | Partial See caveat 1 |
| HEY Mail | Untested |
| Fastmail | Untested |
| Superhuman | Untested |
Works in 8: Gmail, Gmail Android, Outlook 365 and 5 more. Show all
| Client | Support |
|---|---|
| Gmail | Works |
| Gmail Android | Works |
| Outlook 365 | Works |
| Outlook (New) | Works |
| Outlook Android | Works |
| Samsung Mail | Works |
| Thunderbird | Works |
| Proton Mail | Works |
Caveats (1)
- 1. Gmail iOS, Outlook iOS, Apple Mail, Apple Mail iOS: Partial. Supports
underbut notrightandleft
Caveats as recorded by caniemail (MIT), one entry per wording.
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