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.