Email clients

Several Major ISPs and email clients support structured email already today. With forthcoming standardization efforts, this list is likely to grow further.


Client Status
KMail ✅ Supported
Thunderbird Support planned
Outlook Support planned


Client Status
Cypht Support planned
Nextcloud Mail ✅ Supported
Roundcube Support planned

Vendor-specific clients

Vendor Status
Gmail ✅ Supported
Yahoo ✅ Supported
WEB.DE ✅ Supported

See for Email for details.