I just performed a similar migration. I used the Ubuntu Postfix/Courier guide by Falko with the original box. So for the new machine I followed that same guide and copied my conf files to a note pad so I could compare any specific changes I made. Once the server was up and running I used the admin.php front end by Volksman to create my users. Once they were all created I used rsync to copy the entire domain directory under /home/vmail/ to the new server. Worked like a charm!
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