← CSS Support IndexDoes CSS
Does CSS @import Work in HTML Email?
This is the description of the `@import` property.
Quick Answer
Does @import work in HTML email?
The CSS @import property is supported in Outlook (Windows), Outlook (Mac / Web), Apple Mail, ProtonMail. It is NOT supported in Gmail, Yahoo! Mail, Thunderbird, and others. Always include a safe fallback for unsupported clients.
Which Email Clients Support CSS @import?
CSS support for @import across email clients
| Email Client | Desktop | Mobile / Web | Notes |
|---|---|---|---|
| Gmail | ✗ No | ✗ No | — |
| Outlook (Windows) | ✓ Yes | ? | — |
| Outlook (Mac / Web) | ✓ Yes | ✗ No | — |
| Apple Mail | ✓ Yes | ✓ Yes | — |
| Yahoo! Mail | ✗ No | ✗ No | — |
| Samsung Email | ? | ✗ No | — |
| Thunderbird | ✗ No | ? | — |
| ProtonMail | ✗ No | ✓ Yes | — |
| Fastmail | ✗ No | ? | — |
Frequently Asked Questions
Test Your Email Now
Paste your HTML and see how it renders in clients that don't support @import.