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 Under development


Client Status
FairEmail Support planned
K-9 / Thunderbird Mobile Support planned
Outlook Mobile Under development


Client Status
Cypht Support planned
Mox Webmail Support planned
Nextcloud Mail ✅ Supported
Roundcube Supported
SnappyMail Support planned
Outlook Web App (OWA) Under development

Vendor-specific clients

Vendor Status
AOL ✅ Supported
Gmail ✅ Supported
GMX ✅ Supported
Yahoo ✅ Supported
WEB.DE ✅ Supported
Zoho Mail ✅ Supported

See for Email for details.