WHAT DO WE DO? THE LONG VERSION
E-Mail first passes through our perimeter routers, where it is examined by the first layer of virus protection. It then reaches our perimeter gateway where we apply selective greylisting, tarpitting and recipient validation. It is then passed to the server farm where it is examined by two more anti-virus applications, a Zero Hour antivirus database is consulted, tests that review the sending server, tests that review the mail route taken, tests that review how the message was assembled, and tests for common mail vulnerabilities. After that the message is examined for a round of special internal tests, a number of public and private RBL lists are consulted, and then the message content itself is examined. The content syntax is compared to a number of filters, and then links within the message are compared to URIBL lists.
At this moment, there are 118 tests defined.
BUT WHY DOESN’T IT JUST DELETE ALL THE SPAM?
We focus on supporting businesses, and businesses can’t afford to lose mail. Though we painstakingly test all of your mail, we don’t apply a heavy hand to rejecting mail. We’d rather mark it and let you decide.