Postfix - Return-Path header
I have a problem with mail's headers.
I have software for sending newsletters, I used the php function before and I could force the return-path in the php.ini.
So, after an update of the software, the php function mail() is not uses, but it's a socket SMTP in php which is used to sending mail.
My problem is deal with the bounce mail return, I don't want it's the client which receive this but only the postmaster of postfix for example.
I have tried to specifiy the header return-path in the code but it's the from which is affected to my return path.
So, Does it possible to affect in postfix the return-path for example?
Maybe somebody have an another solution?
(Sorry for the spelling, i'm french...)