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