ProtonMail and Tutanota don’t primarily support IMAP (well, ProtonMail does as an option with an additional “bridge application“). Take a look at Posteo.de (if

ProtonMail and Tutanota don’t primarily support IMAP (well, ProtonMail does as an option with an additional “bridge application“). Take a look at Posteo.de (if you’re fine with no support for custom domains) and mailbox.org and runbox.com if you want custom domain support. If you’re fine with the provider being in the U.S. and want a cheap solution for multiple domains, then mxroute may be good. It also has some very cheap plans and offers going on (check the lowendtalk.com forums).