A free anti-spam tool for Exchange environments

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Article from ADMIN 08/2012

By Thomas Joos

Anti-Spam SMTP Proxy gives companies who deploy their own email server a free, but extremely powerful, anti-spam solution.

The Anti-Spam SMTP Proxy [1] (ASSP) acts as a proxy server between the Internet and local email servers, where it filters all email for spam. The ASSP open source server solution is also suitable for Exchange environments because it is based entirely on SMTP.

The solution supports all of the current Exchange versions, including Exchange Server 2010, relying on Bayesian filters, SPF scanning, its own honeypot, and real-time blacklists, among other features. Management takes place through a web interface. Additionally, you can scan mail for viruses with ClamAV. The feature scope is easily on a par with that of commercial solutions. If your company is looking for an anti-spam solution, ASSP is definitely worth considering.

After the trouble-free installation, the filter is up and running in a couple of minutes. Web interface-based management also makes the setup process very convenient (Figure 1).

Figure 1: Management interface in Anti-Spam SMTP Proxy.

Smaller businesses might also be interested in the POP3 connector in ASSP. This feature lets you pick up email from various POP3 servers, scan the messages for viruses and spam, and then forward the results to internal email addresses. One conceivable application for a scenario like this would be

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