I can fix the problem by deleting the index files for each non-compliant mailbox. eg: /.indexes/.Sent/dovecot.index
Dovecot then recreates the index files. The ownership and permissions of the new & deleted indexes are the same. However, these index files soon get corrupted. I think it might be imapsync corrupting them because I can access the mail using Thunderbird, and run imapsync successfully *once* (again), but after that the index files appear to be corrupt because the mailbox stops allowing access until I delete the index files again. Anyone have any experience with index files becoming corrupted or inaccessible? Maybe I should try moving them off the network drive.... cheers matt p
