Eh, we can disagree on a precise definition of abstract "conflict resolution", but I'm referring to unison's behavior with -batch. There's no logical conflict that needs to be resolved by user choice or algorithm. When looking at the larger system of all the replicas, unison's behavior is to simply undelete a file that was explicitly deleted.

> Why? IMAP already takes care of synchronization, without any potential problems.

Less configuration, less attack surface. Sharing mail over NFS is a common thing, and I view unison as a type of distributed filesystem.