The organisation I work for has 600 users and we use Postini; fabulous results, rare instances of a spam getting through. Definite spam items are discarded, each user gets a daily summary of trapped items that are probably spam; the user can release (unless it contains a forbidden attachment, such as a virus) or if ignored for 14 days the trapped item is discarded.
I have clients with >100,000 users on Postini, and others with as few as 50 users on Postini; all are just as happy with the service. My organisation will not go back to running our own infrastructure for trapping spam. By having Postini do the "heavy lifting" we experienced a 76% reduction in bandwith consumption as spam was trapped at Postini, instead of being downloaded to our mail infrastructure only to then be discarded.
Slashdot Mirror
I have clients with >100,000 users on Postini, and others with as few as 50 users on Postini; all are just as happy with the service. My organisation will not go back to running our own infrastructure for trapping spam. By having Postini do the "heavy lifting" we experienced a 76% reduction in bandwith consumption as spam was trapped at Postini, instead of being downloaded to our mail infrastructure only to then be discarded.