Again:

It is a very _bad_ idea to block hosts with the keyword dhcp in the rdns name.
A lot of static hosts (hostingcenter etc.) have this keyword in their rdns and
they all are static.

> 74-142-212-17.dhcp.insightbb.com  (74.142.212.17)

This is listed in the cbl. Only because blacklists need some short time to 
detect
emitting spam ips it is not worth to create filters that gives you al lot of 
false
positives.

Lutz Petersen

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