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	Under development

Mobile

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

Webmail

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 Schema.org for Email for details.