A popular configuration for the ISA firewall is to use it as an inbound SMTP filtering relay. You can setup the ISA firewall as an inbound SMTP relay and leverage the built-in SMTP filter and SMTP Message Screener to offload some of the spam and attachment filtering duties from your dedicated spam whacking device or Exchange Server located on an ISA firewall Protected Network. While the ISA firewall’s SMTP Message Screener isn’t a full-fledged spam whacking and e-mail anti-virus solution, it can perform some initial processing on incoming messages, which takes some heat off your dedicated e-mail scrubbing devices. This article shows you how to make it happen.

By Thomas W Shinder at ISAserver.org

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