Integrity check of mailboxes before dsync

Hi All,

I am migrating a large number of Dovecot mailboxes - some of them are quite old.  I hit an issue yesterday with a corrupt file (index?) that was preventing the mailbox from being synced properly  As soon as I removed the file the dsync worked.  Is there a way to check the integrity of each mailbox / indexes before I dsync it?  

Thanks

Murray