I'm very happy with https://mailbox.org/ https://mailbox.org/. They are based in Berlin, Germany right here in my neighborhood. They offer: * Caldav/Carddav *

I'm very happy with https://mailbox.org/ https://mailbox.org/. They are based in Berlin, Germany right here in my neighborhood. They offer: * Caldav/Carddav * Optional at rest encryption using your PGP public key * Microsoft Exchange API * Pretty decent web mail interface * For iOS/macOS: Configuration profiles that make it really easy to start configuring new devices * Easy domain aliases * Cheap and affordable (< 20 Euro per year)