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
Apple Mail	✅ Partially supported¹
KMail	✅ Partially supported¹
Thunderbird	🚧 Under development (Note)
Outlook	🚧 Under development
Parula	🚧 Under development

Mobile

Client	Status
FairEmail	Support planned
Outlook Mobile	🚧 Under development
Thunderbird Mobile (K9)	🚧 Under development (Note)

Webmail

Client	Status
Cypht	Support planned
Mox Webmail	Support planned
Nextcloud Mail	✅ Partially supported¹, Extended support under development
Roundcube	✅ Supported
SnappyMail	Support planned
OpenXchange	🚧 Under development
Outlook Web App (OWA)	🚧 Under development
Zimbra	🚧 Under development

Vendor-specific clients

Vendor	Status
AOL	✅ Partially supported¹
Gmail	✅ Partially supported¹
GMX	✅ Partially supported¹
Yahoo	✅ Partially supported¹
WEB.DE	✅ Partially supported¹
Zoho Mail	✅ Partially supported¹

¹ “Partially supported” means that only certain particular use cases are supported.

See Schema.org for Email for details.