I use Apple Mail with SpamSieve as a drone on a Mavericks iMac. I’ve noticed that Apple Mail no longer syncs its changes with the server. That is, on the drone computer everything seems fine – Apple Mail is getting new mail, and SpamSieve is sorting out the spam. But my mail server (and any non-drone mail clients) still sees all of the spam in my inbox. Apparently none of the changes that SpamSieve makes are getting to the server. If I simply quit and restart Apple Mail on the drone, a sync magically happens, and all of the spam is then moved out of my server-side inbox.
If memory serves, this issue began with the release of OS X 10.9.2 (and I think SpamSieve had an update at that time as well). Although I’m not 100% sure the problem started right after the update, I do know everything was working fine in 10.9.1. And I’ve read that Apple made some changes to the way Mail syncs in 10.9.2 (mostly for Gmail compatibility), so perhaps this is a bug caused by those changes.
To narrow down the problem, I’d like to eliminate Apple Mail as a variable and switch to some other client. Could I get a recommendation for an email client that works well with SpamSieve?