David Hláčik wrote: > As example mail from root at sx1.labs.polarion.com should be masqueraded > to mail from root at polarion.com and etc. > This is very easy fix in sendmail, but how to do this in postfix - and > not to break virtual domains configuration. I believe in your /etc/postfix/main.cf file, just add the following: masquerade_domains = foo.example.com example.com Postfix docs: <http://www.postfix.org/ADDRESS_REWRITING_README.html#masquerade> Regards, Max