This is a follow up to a previous (solved) question at http://www.experts-exchange.com/Software/Server_Software/Email_Servers/Postfix/Q_24135863.html
I have managed to strip the sender header, and do other modifications. This is working great now, but still my private email address is shown in the full message in the "Return-Path" header or whatever it is.
If I understood rightly from here and there, Return-Path is not a normal header and therefore I can't change it as I already do for the sender, and that might be the reason why it is not working, as if the rules I set for Return-Path were completely ignored.
What I want to do is be able to send emails from a -say- public email address (eg. email@example.com) from my Google Apps Premier Edition account, which is associated with the address -say- firstname.lastname@example.org.
When I send emails as email@example.com, for example to forums (or if I register to newsletters, services, etc), I don't want my private email address (which is made of name+surname) to be shown anywhere.
So, the question is: how can I make sure (with my postfix server, used as relay for Google Apps PE), that the "Return-Path" shows the email address I am sending the email from, rather then the default/primary email address?
Thanks in advance.