Exchange Defender

Looks like Exchange Defender has been improved. I have a site that uses Exchange Defender and it works very well.

http://www.ownwebnow.com/blog/2008/03/the-new-soul-of-exchangedefender/

In some ways however a software based solution does have advantages in that you can set it up instantly, it knows about new users/smtp-addresses and you can troubleshoot/make policy changes in real time.

We are also using EHS from Frontbridge / Microsoft - The advantage here is that it can be purchased via Microsoft licensing with everything else.