@import
CSS at-rule · 5 supported, 0 partial, 10 unsupported across 15 clients
Client Support
| Client | Category | Engine | Support |
|---|---|---|---|
| Gmail | webmail | Gmail Web | Unsupported |
| Gmail Android | mobile | Gmail Mobile | Unsupported |
| Gmail iOS | mobile | Gmail Mobile | Unsupported |
| Outlook 365 | webmail | Outlook Web | Unsupported |
| Outlook (New) | desktop | Outlook Web | Supported |
| Outlook Classic | desktop | Microsoft Word | Supported |
| Outlook iOS | mobile | Outlook Mobile | Unsupported |
| Outlook Android | mobile | Outlook Mobile | Unsupported |
| Apple Mail | desktop | WebKit | Supported |
| Apple Mail iOS | mobile | WebKit | Supported |
| Yahoo Mail | webmail | Yahoo | Unsupported |
| Samsung Mail | mobile | Samsung | Unsupported |
| Thunderbird | desktop | Gecko | Unsupported |
| HEY Mail | webmail | WebKit | Supported |
| Superhuman | desktop | Blink | Unsupported |
Client-by-client behaviour for @import
Fully supports @import (5): Outlook (New), Outlook Classic, Apple Mail, Apple Mail iOS, HEY Mail.
No support (10): Gmail, Gmail Android, Gmail iOS, Outlook 365, Outlook iOS, Outlook Android, Yahoo Mail, Samsung Mail, Thunderbird, Superhuman. Plan fallbacks for these clients before relying on @import in production sends.
Fixes & Workarounds
Gmail
Unsupported"@import" is not supported in this email client.
Gmail Android
Unsupported"@import" is not supported in this email client.
Gmail iOS
Unsupported"@import" is not supported in this email client.
Outlook 365
Unsupported"@import" is not supported in this email client.
Outlook iOS
Unsupported"@import" is not supported in this email client.
Outlook Android
Unsupported"@import" is not supported in this email client.
Yahoo Mail
Unsupported"@import" is not supported in this email client.
Samsung Mail
Unsupported"@import" is not supported in this email client.
Thunderbird
Unsupported"@import" is not supported in this email client.
Superhuman
Unsupported"@import" is not supported in this email client.
Related Features
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Try Emailens FreeSupport data last updated Apr 27, 2026 · synced from caniemail.com via @emailens/engine.