[qmailtoaster] Script to automate set password

[Gmail]

Hi all,
I’ve installed qmailtoaster with vpopmail enable mysql. I assume that I have a 
password file and a username file (each username is matched with password in 
same line). How do to write a script to create mailbox with username and 
password get from 2 files?. I think this is useful for import user mail to 
vpopmail.
Thanks so much.