Over the last year our internet has been very slow and over loaded with traffic. We have been hosting five different websites and an exchange server on the internet connection that is also shared with our staff offices.
The problem being, we were getting around 10,000 spam messages per day hitting our servers- most to email addresses that did not exsist on our network.
About three months ago- we swtiched to Katharion (http://www.katharion.com/) to filter our emails before they hit our internet connection/server.
We then configured our ISA server to only let incomming connections from Katharions allowed subnets and IP address ranges.
It has worked very well- and we get very few false positives.
Since- in the last month we have configured LDAPs with a secure certificate issued on both of our ends to sync our user accounts from Exchange / Active Directory up to Katharion automatically.
This allows us to do single sign on with active directory accounts to a service that is not even located on our campus. We are very pleased with there service.








