[Dshield] "Academic Freedom" vs Computer Security

Doug White doug at clickdoug.com
Fri Feb 13 05:56:25 GMT 2004


Thanks for the example. It looks like my filtering is doing a better job than
the rather costly Postini service.  It is explained in the link in my signature
line.
While I do have a personally maintained blacklist, I also use cbl, spamhaus,
sorbs, spamcop, and a few others.

That one example of "received from unknown" is rejected immediately by Postfix
anyway, and does not even get to the filtering.

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----- Original Message ----- 
From: "Erik van Straten" <emvs.dsh.3FB4CC72 at cpo.tn.tudelft.nl>
To: <list at dshield.org>
Sent: Thursday, February 12, 2004 9:19 PM
Subject: Re: [Dshield] "Academic Freedom" vs Computer Security


: Doug,
:
: On Thu, 12 Feb 2004 19:07:17 -0600 Doug White wrote:
: > I don't know how Brightmail or Postini handles it, but I suspect
: > much the same way, and they are not going to accept spamming from any
: > IP, no matter who the academic source.
:
: They accept from seemingly ANY source. Then evnetually mail bounces to
: someone else like me (below, vguzmanym at cpo.tn.tudelft.nl does NOT
: exist, and this is the last one I have from/via Postini):
:
: | Received: from neutron.nccray.com (unknown [66.97.228.6])
: |         by mailhost3.tudelft.nl (Postfix) with ESMTP id A70144081
: |         for <vguzmanym at cpo.tn.tudelft.nl>; Fri, 13 Feb 2004 03:36:12 +0100
(MET)
: [snip]
: | 550 <cshepherd at nccray.com>... User unknown
: |
: |    ----- Original message follows -----
: | Received: from psmtp.com (exprod5mx103.postini.com [12.158.34.59])
: |         by neutron.nccray.com (8.9.3/8.9.3) with SMTP id UAA20175
: |         for <cshepherd at nccray.com>; Thu, 12 Feb 2004 20:37:37 -0600
: | Received: from source ([64.53.54.194]) by exprod5mx103.postini.com
([12.158.34.245]) with SMTP;
: |         Thu, 12 Feb 2004 18:35:59 PST
: | Message-ID: <bb1201c3f1da$93f36147$41d5ccaf at hsqqmbb>
: | MIME-Version: 1.0
: | To: cshepherd at nccray.com
: | Subject: hi
: | From: "Vanessa Guzman" <vguzmanym at cpo.tn.tudelft.nl>
: | Date: Fri, 13 Feb 2004 02:39:55 +0000
:
: Note: http://cbl.abuseat.org/lookup.cgi?ip=64.53.54.194
: | IP Address 64.53.54.194 was found in the CBL.
: |
: | It was detected at 2004-01-18 10:00 GMT (+/- 30 minutes).
:
: Since 11 Feb 2004 22:11:00 +0100 in total 103 messages like this
: JUST from Postini :(
:
: > Your mileage may vary.....
:
: It does (not seeing much Brightmail).
:
: Regards,
: Erik van Straten
: Delft University of Technology
: The Netherlands
:
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