[140928] in North American Network Operators' Group
blocking annoying 'bounce mail' "feature" from customers use.
daemon@ATHENA.MIT.EDU (Eric J Esslinger)
Wed May 25 12:09:39 2011
From: Eric J Esslinger <eesslinger@fpu-tn.com>
To: "'nanog@nanog.org'" <nanog@nanog.org>
Date: Wed, 25 May 2011 11:09:34 -0500
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
Mac Mail (and others) have a "feature" that allows my customers to generate=
a fake NDR message and send it back through my server. I get about a custo=
mer every few months that discovers this 'solution' to spam emails, and whe=
n it happens they cause delivery problems for my customer mail server by ge=
nerating backscatter.
Today I just ended up on a list that won't take me off for quite a while (o=
r unless I pay).
Does anyone know of a way for me to block the following, using postfix, eit=
her via refusing to accept the mail or by dropping it in /dev/null:
Mail from <> or postmaster that originates within our customer IP blocks/is=
sent using authentication at the submission port and/or that does not have=
a valid local recipient.
I can't find any ready made recipies online for this sort of thing in a sho=
rt dig around for it, and while I think it's possible, I was wondering if a=
nyone else was already dealing with this and could say 'oh yeah just put li=
ne blah in header_checks'. I would think it would be simple once you find i=
t but you know how it is.
(I've already dealt with the customer in question but I'm getting tired of =
this popping up every month or three.)
__________________________
Eric Esslinger
Information Services Manager - Fayetteville Public Utilities
http://www.fpu-tn.com/
(931)433-1522 ext 165
This message may contain confidential and/or proprietary information and is=
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