Hi. This is not a canned response. I'm a linux sysadmin with 20 years of experience. I'm currently maintaining high throughput Linux email servers for many companies and have experience with Postfix, Sendmail and Exim, POP/IMAP servers(Dovecot, Courier, Cyrus). I can create a script with your required input that sets everything up and explain to you, in a reproducible way, every ste. If you need me to do this on an existing server, I'll create a screencast so you can watch everything in detail later. I know how to do this and can help you in no time, just let me know.