CSS property · data last changed 10 Nov 2026
text-decoration-style in email clients
Works in 16 of 21. Not supported in Outlook Classic and AOL Mail. Untested in HEY Mail, Fastmail and Superhuman.
Your reader in Outlook Classic sees the email without text-decoration-style, 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-decoration-style in Outlook Classic. Design so the email still reads without it.
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text-decoration-style 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 |
| AOL Mail | Not supported |
| HEY Mail | Untested |
| Fastmail | Untested |
| Superhuman | Untested |
Works in 16: Gmail, Gmail Android, Gmail iOS and 13 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 |
| Proton Mail | Works |
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fix
Every feature in Outlook Classic · All email CSS features · What real installs show
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