Meng Weng Wong wrote:
On Tue, Apr 20, 2004 at 01:19:26AM -0400, April Lorenzen wrote:
|
| This document offers a recommended standardized FQDN (Fully Qualified
| Domain Name) naming convention pattern for servers used to send outbound
| internet email. The purpose is to allow inbound internet email servers
| to recognize outbound email servers designated as authorized or
| unauthorized by those in control of DNS for the sending server IP addresses.
|
This is an interesting alternative approach to the MTAMark space.
On that note, I would like to mention that our single most successful
antispam rule at Pobox is "does it look like a broadband host". We can
tell if a machine is a broadband host simply by checking if the hostname
contains the IP address. Broadband machines usually PTR to something like
6535215hfc174.tampabay.rr.com
c-24-8-173-129.client.comcast.net
This is not always true, the following message from NANOG illustrates that:
http://www.merit.edu/mail.archives/nanog/msg03414.html
Yakov
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Yakov Shafranovich / asrg <at> shaftek.org
SolidMatrix Technologies, Inc. / research <at> solidmatrix.com
"Some lies are easier to believe than the truth" (Dune)
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