We run our own exchange server - it has ESET NOD32 Mail security for exchange installed.
Seems to do an ok job on defusing malware, but recently the amount of SPAM/Malware has been increasing a bit and the Junk is starting to get a little annoying.
We have around 30 accounts (each has a couple of aliases)
I know there are various providers that will divert your mail through their mail scanning servers and screen/remove Infected items/SPAM before it gets to your exchange server. Some claim some rediculous effectiveness figures 99.99999% - some say something like 97% effective. Probably cant take any of those figures too seriously.
Anyone got any suggestions or stories on who/what they are using and how well it works?