How does our email filtering system work?

Pennswoods.net has contracted with Postini to provide our email spam and virus filtering.

This is an explanation of how it works and what you can expect.

Postini delivers preemptive threat prevention that identifies connection and content threats before they can reach your corporate network. Postini stops more than 98% of spam, phishing exploits, all viruses, directory harvest attacks and IM worms with patented, multi-layer technology that delivers unmatched intrusion prevention and protection for email and instant messaging.

Postini Perimeter Manager blocks unwanted spam messages, and malicious code with a 98% or better accuracy (backed by our service level guarantee) based on our exclusive technology and our experience processing about 5 billion email messages every week. Most importantly, Postini blocks spam and viruses before they pass through your enterprise firewall, saving bandwidth, server capacity, and minimizing administrative costs.

Typical email security software may assess message content or the source IP address of an email message, but it can't secure SMTP connections. Postini Perimeter Manager automatically stops Denial of Service (DoS) and Directory Harvest Attacks (DHA) that can sap up to 30% or more of your email server transaction capacity as servers attempt to respond to these brute force probes.