Is there something like this for features techies might care about? Like some sort of guarantee of at-rest encryption, SMTP/IMAP/POP/etc support, end user encry

Is there something like this for features techies might care about? Like some sort of guarantee of at-rest encryption, SMTP/IMAP/POP/etc support, end user encryption, reasonably fast search, backup/restore, etc. GNOME Evolution and Thunderbird, at least last I used it, have abysmal search speed, taking seconds to search through a local DB of a few thousand emails. So they're clearly using search tech much inferior to a local DB with indexes.