www.postini.com
recently bought by google...
if you have 200 user and if 1 person ask you to find a "spam" that got flagged, etc.. or retune the rules. This will take more than the standard 5 min.. and if you multiple that by 200 a day.. you'll pull your hair out
your rules are not as good as a service providers rules... do you really wanna deal with 200 users a day just on spam ?
postini gives you the ability to block people globally or on individual basis.. ie your spam may not be someone else's spam..
since spam are filter at the postini sites, you have less junk hitting your server, less bandwidth wasted
if someone has spam, just fwd it to
spam@postini.com and they'll review the header and update it... i been through 2 hedgefund that uses postini and it has been great... its very easy to use and the users love it.
I tried most of the software, if you break it down by cost, its not worth the time you spend on it..
postini was charing me 3/user / month.. 36 bucks a year a user..