[65668] in North American Network Operators' Group
Re: AOL rejecting mail from IP's w/o reverse DNS ?
daemon@ATHENA.MIT.EDU (Petri Helenius)
Thu Dec 4 17:38:11 2003
Date: Fri, 05 Dec 2003 00:36:45 +0200
From: Petri Helenius <pete@he.iki.fi>
To: Suresh Ramasubramanian <suresh@outblaze.com>
Cc: Chris Lewis <clewis@nortelnetworks.com>, nanog@nanog.org
In-Reply-To: <3FCF9270.6080606@outblaze.com>
Errors-To: owner-nanog-outgoing@merit.edu
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?
Pete
