I've been leasing a Windows dedicated server from Fasthosts for just over a year now. It's running Windows Server 2003 Web Edition, build 3790.
It comes with a Matrix control panel [220 Matrix SMTP Mail Server v(1.4)] but apart from that is a bare bones server.

I'd really like to set up a server side spam filter but am having difficulty finding anything.

I've tried Mailwasher with the conduit to Firetrusts "first alert" service but I'm now told that they (firetrust) don't support the Matrix interface.

Can anyone suggest a server side spam filter with a simple interface that I can use.

I'm not just looking for something that's free, although a good open source application would be ideal.

Thanks for any help.