[65669] in North American Network Operators' Group
Re: AOL rejecting mail from IP's w/o reverse DNS ?
daemon@ATHENA.MIT.EDU (Suresh Ramasubramanian)
Thu Dec 4 17:42:51 2003
Date: Thu, 04 Dec 2003 17:41:55 -0500
From: Suresh Ramasubramanian <suresh@outblaze.com>
To: Petri Helenius <pete@he.iki.fi>
Cc: Chris Lewis <clewis@nortelnetworks.com>, nanog@nanog.org
In-Reply-To: <3FCFB6FD.1070403@he.iki.fi>
Errors-To: owner-nanog-outgoing@merit.edu
Petri Helenius writes on 12/4/2003 5:36 PM:
>> 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?
I would refer you to the huge number of netblocks out there that stay at
/16 or larger size, with the upstream not SWIP'ing or otherwise
delegating netblocks in APNIC (or wherever, such as an rwhois server) as
they provision IPs.
srs
--
srs (postmaster|suresh)@outblaze.com // gpg : EDEDEFB9
manager, outblaze.com security and antispam operations
