Mailing List CGatePro@mail.stalker.com Message #98186
From: Jeff Wark <jwark@tbaytel.net>
Subject: Re: DUL/PBL and other policy block lists
Date: Mon, 29 Jun 2009 08:45:23 -0400
To: CommuniGate Pro Discussions <CGatePro@mail.stalker.com>
What do you do then when someone like MAPS or SORBS adds you to their own list and then won't take you off unless you comply with their 'standards'?  You're still in the same boat.

At least with Spamhaus, they have an interface that you can update yourself.

Fred Zwarts wrote, at 6/26/2009 4:11 AM:
"Jeff Wark" <jwark@tbaytel.net> wrote in message news:list-54210974@mail.stalker.com...
We currently have our dynamic IP address blocks listed with spamhaus [through their PBL] and with MAPS [in their DUL].

We have a customer sending mail through our server to another recipient...pretty standard stuff.  Here is what my logs are saying:

*our server getting the message*
2009-06-25_10-00.log:10:30:47.981 2 SMTPI-269182([216.26.223.110]) [2612154] received, 4518 bytes
2009-06-25_10-00.log:10:30:47.981 4 SMTPI-269182([216.26.223.110]) rsp: 250 2612154 message accepted for delivery

*our server sending the message*
2009-06-25_10-00.log:10:30:48.268 4 SMTP-015270(on.sja.ca) [2612154] sending
2009-06-25_10-00.log:10:30:49.060 1 SMTP-015270(on.sja.ca) [2612154] message body rejected, got:554 mail from 216.26.223.110 refused, see http://www.spamhaus.org

It appears that the server on.sja.ca is doing some sort of 'deep scanning' of the received headers and rejecting an email if the email in question has originated on any computer with an IP address listed in a blacklist/policy list somewhere.  This seems to completely defeat the usefulness of these lists.  The IP is not on any other blacklist at www.spamhaus.org, only the PBL.

Has anyone else experienced this recently?  It happened with another server a few weeks ago.  These people must be rejecting legitimate email all over the place if they will not accept an email that has touched a dynamic IP address.

Yes, this happens. That is one of the reasons we do not add our addresses to such lists.
We configure our routers/switches to block outgoing port 25 (SMTP) access for addresses that should not send E-mail. This is more effective and less sensitive for such errors. And problems can be solved locally in case of errors.


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--
Jeff Wark
TBayTel Internet
807-625-3041
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