How to track spoofer

I have someone that keeps trying to use my domain extention to send mail.
It keeps coming up in my log files with various names attached to my domain. I don't mean denied relaying. My actual domain, ie Spoofer@mydomain.com, is being used.

How do I :
A) Stop him
B) Track him
C)keep them from coming back
D) (Optional) Boot his A$$

thanks

Frog

What is domain extention?

Dissable mail relaying and make sure you have no open proxy servers in your network. check ordb.org and have them test your server. also dissable IMAP and POP3 if not using them.

To test mail relaying telnet to your server on port 25 and do the following


helo
mail from:userid@internetdomain.com
rcpt to:userid@internetdomain.com
data
This is a test.

use a hotmail account and see if you recieve the mail or if you got
a deny response.

Thnks for the info.

would it help if I went to proc mail or another mail client with more security?