[softjobs]

Only Stalwart supports JMAP, which imo is the future of mail/calendar/contacts client-server communication.

https://jmap.io/

[logifail]

It seems JMAP isn't universally loved, see for instance the spirited discussion in [0], although I've no direct experience.

My Maildirs "justed worked" though, and have been moved across dozens of servers - not to mention worked in so many different filesystems - over the years.

[0] https://news.ycombinator.com/item?id=19876710