lammert - 2:13 pm on Oct 19, 2010 (gmt 0)

No problem if you are new to this. We are here to help you :) There are options. But to know which option you need, we need a little bit more information.

Are the messages received by your server, or sent by your server?
Is the content of Return-path: and Envelope-to: always the same, or different?