Can DCC reject mailed-back non-delivery reports?

Gary Mills mills@cc.umanitoba.ca
Mon Aug 27 15:46:58 UTC 2007


We've had a couple of incidents where people's mailboxes have been
inundated with backscatter because spammers have been forging their
e-mail address as the sender of spam.  I'm ready to reject all mailed-
back non-delivery reports, if sendmail could do that, but I'm wondering
if DCC has a way to do it.  Perhaps DCC could be more selective.

A sendmail log entry looks like this:

    Aug 22 09:20:52 electra sm-mta[19211]: [ID 801593 mail.info] l7MEKpTH019211: from=<>, size=12709, class=0, nrcpts=1, msgid=<200708211700.l7LH0N1O005470@smtp08.msg.oleane.net>, proto=ESMTP, daemon=MTA, relay=bounce02.msg.oleane.net [62.161.4.52]

In this instance, the backscatter is from France Telecom.  Their MX is
ironport.dih.oleane.net, which suggests it's one of those lovely
anti-spam appliances that's doing the dirty work.

When the message is delivered here, the interesting headers are:

    Return-Path: MAILER-DAEMON@cc.umanitoba.ca
    From: Mail Delivery Subsystem <MAILER-DAEMON@smtp08.msg.oleane.net>
    Message-Id: <200708211700.l7LH0N1O005470@smtp08.msg.oleane.net>
    MIME-Version: 1.0
    Content-Type: multipart/report; report-type=delivery-status;
            boundary="l7LH0N1O005470.1187715623/smtp08.msg.oleane.net"
    Subject: Returned mail: see transcript for details
    Auto-Submitted: auto-generated (failure)
    X-DCC-UofM-Metrics: electra 1033; Body=1 Fuz1=1 Fuz2=1

Is there anything here that DCC can grab onto?

-- 
-Gary Mills-    -Unix Support-    -U of M Academic Computing and Networking-



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