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.
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