Working example of main.cf with virtual domains

[secSwami]

Hi,

After trying for another day to get my postfix config to work for 
virtual domains, I would really appreciate if someone can give me an 
example of WORKING main.cf file.
The problem I am having is whenever a MOBILE user is trying to send 
email to ANYWHERE using the postfix server and Thunderbird/Outlook 
Express client, they get error message saying relay access denied.

I would appreciate some help on this.

Thanks in advance.