Spam Blockers for Exchange Server

[dvduval]

I'm interested in finding an economical solution that blocks spam on Exchange server. One person recommended xwall. Is there anything else out there worth investigating?

[DaveAtIFG]

This search [google.com] produced quite a few promising results. IMHO, it's a crime to use M$ anything for email! ;)

Anyone have any USEFUL suggestions?

[Mardi_Gras]

A good place to look would be slipstick.com, if you haven't already. One of the premier Outlook/Exchange sites around.

[TomWaits]

I've heard good things about CommTouch's ASAP product. Searches for "enterprise spam filtering" and "enterprise spam filter" will give you many options.