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How to install and configure GFI MailEssentials on a Windows SBS 2003

Configuring GFI MailEssentials for Anti-Spam

6.  Configuring the Bayesian Analysis

The Bayesian Analysis is the main spam filter of GFI MailEssentials because it works better and it is constantly self-adapting. To run Bayesian Analysis Filter, check the Enable Bayesian Analysis and also make sure Automatically learn from outbound e-mails is checked. It is recommended to allow GFI MailEssentials to learn from the outbound mails for one or two weeks.

Training users on how to handle “Possible spam” is as important as training the Bayesian filter. For example, if the email is spam and recipient replies to the sender, the GFI will treat the spammer’s emails as legitimate email and let them pass the filter. 

7. Configuring DNS blacklists (DNSBL)

With GFI MailEssentials, you have the option to configure 3^rd party DNS blacklists to block spam emails. This requires a properly configured DNS server and it is beter to use an internal DNS instead of ISP DNS. Multiple DNS blacklists can be enabled to increase the blocking spam rate. However, more than 3 DNS blacklists may slow the email system. It is recommended to test the settings after enabling the DNS blacklists. If the DNS blacklists is not available, email will be processed slowly.