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Dynamic IP Black Listing This is one of many dynamic IP address rules that provide wonderful blocking functionality. Many dynamic/residentialial/dialup IPs are not allowed by this rule. It assumes that a legitimate company on DSL would have its reverse (PTR record) set to its domain and not a generic PTR. For this rule to work, mail clients on DSL/cable/dialup IPs must use SMTP AUTH. Many variations of this rule exist to catch dynamic IP addresses. Using periods instead of hyphens, reversing the dotted IP address ordering, etc., in the Match String column provide for many variations that are commonly used in PTR records for dynamic IP addresses.

The Cool Rule Rule Name: DynamicIP_v1.0.0 Lookup Host/Format: %ir.in-addr.arpa NS Record Type: PTR Match Operator: contains Match String: %ca-%cb-%cc-%cd DNR to Use: 2 Check Authenticated: 2 Action: refuse Action Parameter 01: 550 5.7.1 Your mailserver (%ip) appears to be a dynamic IP. Contact your sysadmin to update your configuration. Download this rule with full entries in a separate text doccument. This cool rule was donated courtest of Tom Shaw tshaw at oitc.com of OITC.

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