RBL Explanation

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Roaring Penguin Software Inc. publishes for DNS-based lists for Hosted CanIt customers. These lists are automatically entered into the Master RBL list (but no rules are created automatically.)

The lists are:

  • Greylist-Stumbler list:

These are machines known to have trouble getting past greylisting. The machines are very likely compromised PCs. We recommend making a rule to add one point for machines on this list, and also to extend the greylist period (if you use greylisting) to 60 minutes.

  • Dictionary-Attacker list:

These are machines known to send mail to many nonexistent addresses. We recommend a rule to add one point for machines on this list.

  • Spam-Source list:

These are machines known to send spam and relatively little non-spam. We recommend adding three points for machines on this list.

  • Good list:

These are machines that send relatively little spam, quite a lot of non-spam, and have no trouble with greylisting or sending to nonexistent recipients. We recommend subtracting 0.5 points for machines on this list.

  • Mixed list:

These are machines that are on the edge of being considered good or bad.