Exchange spam spoof from own domain name - how to block?

We get sometimes spam e-mails on a server that originate from the same public domain name as th e mail server's domain. eg like spamuser@domain.com where domain.com is the mail domain of the server it self.

Is it possible to let exchange/IMF filter messages and do a trace on the originating inbound mails so that the server checks if the MX records and the domain name matches eachother? so we can block the spoofed mails.

thanks,
Pieter

Solution: Exchange spam spoof from own domain name - how to block?

http://www.msexchange.org/tutorials/Configuring-enabling-Sender-ID-filtering-Exchange-2003-SP2.html