Hi, I have successfully installed Postfix on Ubuntu Intrepid thanks to Falko's how to forge article to setup postfix with virtual domains. i have an exchange server which is used exclusively for blackberry enterprise server (blackberry users). i want to use postfix as an internet relay for exchange (blackberry only users). remaining users i already have created in postfix as an virtual domain(non blackberry). the domain exchange uses is the same domain which i have created in postfix. i am confused on how to achieve this. anybody please help me out of this. thanks in advance..