Topic: Import Emails from another Mysql based postfix server

Hi. In have successfully installed iRedmail on Centos 5.0. Everything is working perfectly apart from one. I have an old mail server from where i migrated from. The server was running postfixadmin with mysql. I want to import email from the old mail server into the new mail server such that if i had a user xyz@oldserver.com, i can migrate their emails to user xyz@newserver.com.

Please advise anyone with an idea.