How do I install and configure postfix automatically on Ubuntu 12.04 using apt

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http://askubuntu.com – I installed postfix on a bare bones Ubuntu Server 12.04 by typing the following in the terminal. sudo apt-get install postfix When asked to choose a mail server configuration type, I chose Satellite system. For the System mail name, I entered ww1.example.com and for the SMTP relay host, I selected mail.example.com. Note that I replaced example.com with my own domain. The firewall was configured to only permit inbound traffic on ports 22, 80 and 443. I have numerous applications that successfully use ww1.example.com to relay emails to mail.example.com. Now I'd like to provision new severs (HowTos)