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This is header of mail that i have received on my email from mailchimp:

Received: from ( [])
        by with ESMTP id er6si2501863qab.62.2012.;
        Sun, 03 Jun 2012 05:09:29 -0700 (PDT)

My query is how they add the Sent to: header to the Return-Path dynamically,i also want to implement the same in my mail server,i have tried address masquereading in postfix but it was not of much help may be i am misssing something. My mail server has postfix as an MTA and i have centOs 5 as an OS.

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That format is called VERP.

This can either be generated by the sending application, or can be configured in MTA.

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