Email clients

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

Desktop

Client	Status
KMail	✅ Supported
Thunderbird	Support planned
Outlook	Support planned

Webmail

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

Vendor-specific clients

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

See Schema.org for Email for details.