Postini Perimeter Manager is a hosted E-mail system security service that protects your company from E-mail-borne threats--before they hit your network. Postini's services filter out spam and viruses, protect your E-mail system from a wide range of attacks, and provide your IT organization with tools to secure E-mail connections and regulate E-mail delivery.

Perimeter Manager includes:

- Content Security: protection from spam, viruses, and SMTP-based attacks such as Denial of Service (DOS) and Directory Harvest Attacks (DHAs)

- Connection Management: The ability to automatically block E-mail from known spam domains and IP addresses, and protection from mail bombs and Directory Harvest Attacks (DHAs), in which all company E-mail addresses are stolen and added to spam mailing lists

- E-mail System Management: monitoring and controlling E-mail delivery across your network, with built-in load balancing

- Administrative Control: gives administrators control over content filtering policies and message disposition

- Postini Customer Care: Web and phone support, full access to the Postini knowledge base, and 24/7 one hour emergency response

- Real-time reporting features enable you to analyze the volume and types of E-mail traffic you receive for each organization or domain.