Bounced mail feature

Hi

I am using amazon ses module for sending emails from my site. Its working fine. when any mails bounce due to some reason it returns to the source mail address. i want to set the different path for bounce mail, so i make some change like in set the reurn path = "bounce@mydomail.com"; in place of $ source on amazon.mail.inc page . But still the bounce mail are going in the admin@mydomain.com accont. what changes i need to do in code to set the return path different from the source path.