Can I Email (caniemail) is a reference for checking HTML and CSS support and compatibility across email clients including (prepare yourself): Apple Mail, Gmail, Outlook, Yahoo! Mail, AOL, Samsung Email, Mozilla Thunderbird, ProtonMail, Fastmail, HEY, Orange, LaPoste.net, SFR, GMX, and more!

Can I Email offers a compatibility matrix inspired by the original caniuse.com by @Fyrd and designed by @Lensco. It's a great reference to ensure your emails work across desktop webmail, iOS, Android, macOS, Windows, and other operating systems too.

It's open source on GitHub, and maintained by @HTeuMeuLeu and the team at Tilt Studio.