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I love imapsync: https://imapsync.lamiral.info https://imapsync.lamiral.info This is the way projects used to be, and surprisingly excellent ones still are.

• EvanAnderson 9mo ago
  I haven't had excuse to use imapsync for awhile. I remember using it fondly in the past. I definitely hadn't looked at the site in years. I see that there's a free (for up to 3GB, pay for more) migration service offered there now, too: https://imapsync.lamiral.info/X/ https://imapsync.lamiral.info/X/ That's a pretty cool way to support the project.
• 1718627440 9mo ago
  imapsync is slower than mbsync[1] (both in startup and per message) and doesn't support bidirectional sync[2]. It however handles message identity better than mbsync and supports using different authorization and authentication. For administering our mailserver, I first used imapsync and then patched mbsync to support the Auth header. I still use imapsync to sync the flags afterwards. I think both have high-level race conditions, so maybe take the server offline during a sync. [1] https://isync.sourceforge.net/ [2] https://imapsync.lamiral.info/FAQ.d/FAQ.Two_Ways_Sync.txt