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Your going to have to be a little more specific.
"letter all" does not make sense for most of us.
As it has been pointed out if you want to move mail from one system (qmail) to another (zimbra) probably your easiest method is imapsync.
Or if your just doing this for one user, open both accounts in an IMAP client like Thunderbird and drag folders over.
If your new mail is not getting routed to your Zimbra server/installation then that's another issue.