Received and sent messages very mysteriously do not stay all the time in Inbox and Sent boxes. Some of them just disappear after showing up.
Please help with the solution to the above strange problem.
That’s odd. Can you share your setup (OS, Mailspring version and installation method, type of mail account)?
FWIW, I’ve not seen that behaviour myself. One idiosyncrasy you need to watch out for is when moving mail into folders or deleting it: Mailspring operates on the whole thread, not just the current message, so you’ll get emails removed from Sent into folders as a result. (This continually annoys me.) But given you’re losing emails from the Inbox, too, I guess this isn’t your problem!