Adding headers in Postfix mails

[Sharma, Ashish]

Hello,

I am unable to see the following headers in e-mails received on my Postfix 
e-mail receiving server:


1.       Return-Path

2.       Received: from

Similar to header on gmail

Received: from dev16 ([123.123.123.123])

        by mx.google.com with SMTP id xxxxxxxxxxxxxxxx;

        Tue, 27 Oct 2009 05:52:56 -0700 (PDT)

3.       Return-To:

Please suggest me what should I do to add these headers in the received e-mails.

Thanks in advance.

Ashish