CSS property · 10 real installs 14 Oct 2026 · data last changed 10 Nov 2026
text-decoration in email clients
Works in 14 of 21. Not supported in Proton Mail. Partial in Gmail Android, Gmail iOS, Outlook Classic and 3 more.
Your reader in Outlook Classic may not see text-decoration the way you wrote it, even if it looks right where you tested it.
caniemail (MIT) via @emailens/engine 0.18.22
What to do instead in Outlook Classic
When un-styling links, set text-decoration: none, color, and an explicit display: inline-block on the anchor for maximum coverage. For automatically-detected links (phones, addresses), wrap them yourself in styled anchor tags.
- Partial. Not supported with multiple values.
- Partial.
overlineis not supported.
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text-decoration 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 text-decoration is supported you should see: wavy red underline.
caniemail: text-decoration 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. Not supported with multiple values.
caniemail: text-decoration is partly supported in Apple Mail.
Observed 2026-10-14 (Emailens real-device probe, Apple Mail (macOS)): The multi-value shorthand text-decoration: underline wavy #d33 was dropped whole: no line at all. A single line value works; style and colour need -webkit-text-decoration.
caniemail: text-decoration is partly supported in Apple Mail iOS.
Observed 2026-10-14 (Emailens real-device probe, Apple Mail (iPhone 13)): The multi-value shorthand text-decoration: underline wavy #d33 was dropped whole: no line at all. A single line value works; style and colour need -webkit-text-decoration.
caniemail: text-decoration works in Outlook 365.
This Outlook.com install drops the <style> in the head, so only inline styles apply.
caniemail: text-decoration 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 |
|---|---|
| Proton Mail | Not supported |
| Gmail Android | Partial See caveat 1 |
| Gmail iOS | Partial See caveat 1 |
| Outlook Classic | Partial See caveat 2 |
| Outlook for Mac | Partial See caveat 3 |
| Apple Mail | Partial See caveat 4 |
| Apple Mail iOS | Partial See caveat 5 |
Works in 14: Gmail, Outlook 365, Outlook (New) and 11 more. Show all
| Client | Support |
|---|---|
| Gmail | Works |
| Outlook 365 | Works |
| Outlook (New) | Works |
| Outlook iOS | Works |
| Outlook Android | Works |
| Yahoo Mail | Works |
| Yahoo Mail Android | Works |
| Yahoo Mail iOS | Works |
| Samsung Mail | Works |
| Thunderbird | Works |
| HEY Mail | Works |
| AOL Mail | Works |
| Fastmail | Works |
| Superhuman | Works |
Caveats (5)
- 1. Gmail Android, Gmail iOS: Partial. Not supported with non Google accounts.
- 2. Outlook Classic: Partial. Not supported with multiple values. Partial.
overlineis not supported. - 3. Outlook for Mac: Observed 2026-10-14 (Emailens real-device probe, Outlook 2019 for Mac (legacy app)): The multi-value shorthand
text-decoration: underline wavy #d33was dropped whole: no line at all. A single line value works; style and colour need -webkit-text-decoration. - 4. Apple Mail: Observed 2026-10-14 (Emailens real-device probe, Apple Mail (macOS)): The multi-value shorthand
text-decoration: underline wavy #d33was dropped whole: no line at all. A single line value works; style and colour need -webkit-text-decoration. - 5. Apple Mail iOS: Observed 2026-10-14 (Emailens real-device probe, Apple Mail (iPhone 13)): The multi-value shorthand
text-decoration: underline wavy #d33was dropped whole: no line at all. A single line value works; style and colour need -webkit-text-decoration.
Caveats as recorded by caniemail (MIT), one entry per wording.
How text-decoration behaves
text-decoration controls underline, overline, and line-through styling and is critical for distinguishing links from body copy. Most email clients honor text-decoration on anchor tags, but client-side link styling sometimes adds an underline back even when you've set text-decoration: none.
- Outlook Classic applies a default underline to all <a> elements; you must declare text-decoration: none AND override the link color to fully un-style.
- Apple Mail respects text-decoration but adds a phone-number / address link auto-underline that overrides yours, wrap such content in <a style="text-decoration:none;color:inherit"> to defeat it.
- Yahoo Mail strips text-decoration from non-anchor elements in some sanitizer paths.
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