Marlon -
We've recently installed the Barracuda spam firewall and it does a very good job. Espically since there's no per-user liscensing fees, we don't have to concern ourselves with an additional $1 here or there. Heck, we could also just filter your entire domain thru it for you without much problem or expense and it's practically self administering.... They have a free trial by the way.
Postini does however have a new Directory Sync feature for the Service Provider Edition as well as filtering all unregistered users for viruses. They have also added a second virus scan using Authentium, When McAfee scans an email clean it then will be scanned once again by Authentium.
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