As far as I'm aware this is still valid and is the solution for migrating any Linux/Unix sendmail to Zimbra.
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As far as I'm aware this is still valid and is the solution for migrating any Linux/Unix sendmail to Zimbra.
How does this IMAPsync utility deal with the problem of not knowing each user's password?
If and only if your source and destination IMAP servers support a standard IMAP authenticate feature, then impsync can log on to any user's account with admin credentials. Zimbra, Cyrus, and certain configurations of dovecot, uw-imap, and courier can do that.