I’m not sure what’s the right “language” to use for this, so apologies ahead of this.
I use the software across three offices. Using any other software (Thunderbird etc) if I read, or mark an email read at one location, it would show in the other clients as read. This does not happen with Mailspring. I will read email at any of the office locations, go to another office later, and that day’s worth of email shows as unread. This is driving me nuts! Literally every other software I have tried seems to mark these on the server as read, and that gets sent to the clients. Am I missing a setup option?