North American Network Operators Group

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Re: AOL rejecting mail from IP's w/o reverse DNS ?

  • From: Petri Helenius
  • Date: Thu Dec 04 17:39:54 2003

Suresh Ramasubramanian wrote:

A simple "no rDNS" rule causes too much trouble with our overseas customers. I'm sure AOL discarded that idea for the same reason.

Yup. The model can be extended to "if no rDNS, and if spamtrap hits or other spammish behavior noted from more than X IPs per /24, then block the /24".

And why would blocking the /24 be appropriate instead of matching the registry?