text-decoration

Client-by-client behaviour for text-decoration

Fully supports text-decoration (17): Gmail, Outlook 365, Outlook iOS, Outlook Android, Outlook for Mac, Apple Mail, Apple Mail iOS, Yahoo Mail, Yahoo Mail Android, Yahoo Mail iOS, Samsung Mail, Thunderbird, HEY Mail, Proton Mail, AOL Mail, Fastmail, Superhuman.

Partial support (4): Gmail Android, Gmail iOS, Outlook (New), Outlook Classic. Expect rendering quirks unique to each engine. Partial support typically means a subset of values, an ignored shorthand, or sanitizer-specific rewrites.

When to use text-decoration in email

• Removing underlines from CTA button anchors that are styled as buttons.
• Strikethrough pricing in promotional emails (`text-decoration: line-through`).
• Adding hover underline on web-mode email previews where pseudo-classes are honored.

Rendering behaviour and edge cases

• Outlook on Windows 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.

Recommended fallback strategy

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.

Fixes & Workarounds