Question : SMTP Virtual Server anti-spam

I currently have a SMTP Virtual Server on IIS 6 that is running on Windows Server 2008 and routing mail through to my Hyper-V virtual machines.

Currently there is alot of spam being received by my virtual server and is being relayed through to the internet.

I am looking for a way to secure the service so that it does not relay spam messages, but still allows mail through to my virtual worlds.

Answer : SMTP Virtual Server anti-spam

Third party SPAM software that will scan SMTP traffic (usually by using an SMTP event sink).

This one seems to do the trick: http://assp.sourceforge.net/

Shaun