Achal tomar:
> Thanks for telling me about the RFC,but i want to know what configuration
> changes i have to do in postfix to achieve my goal.

Wietse Venema:
> As per the RFC, Postfix prepends Return-Path: only 
> when it performs final delivery.

Achal tomar:
> ok so how can i change he return path address dynamically for each user when
> he/she sends a mail,so that he return path includes his/her user ID and also

You specify the envelope address when submitting mail.  

For example with the PHP mail() function you specify the envelope
sender with the "additional parameters".

mail('recei...@example.com', 'the subject', 'the message', null,
   '-fsen...@example.com');

http://us2.php.net/manual/en/function.mail.php

        Wietse

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