Mail Server, Web Server and Database Server for same domain on different machines

[Ashoksmclain]

Hi
Can anyone let me know how to install & configure Mail, Web & Database Server on different machines & network the same to work correctly.

Below i have posted how i am trying to configure

Machine 1 - Web Server - To host multiple websites using Ubuntu server (LAMP) and ISPconfig3

Machine 2 - Mail Server - To Handle all the mails for the websites/ domains hosted on web server using iRedMail

Machine 3 - Database Server - To store all the mails of the domains & other Database using Mysql

All the machines will run using Ubuntu Server OS version 12.04 LTS

Please let me know or post me with the urls so that i can get it done correctly

Thanking You in Advance