After some digging I think I have found out that we are running into bug "[ #231776 ] Digest From address causing mail loop", however ours has some twists that I don't think the suggestion in the bug database will fix.

Also, I have some unanswered questions from this bug: headers 'Sender:' & 'Errors-To:' get used? What are these headers suppose

1. Why doesn't the parameter 'LIKELY_BOUNCE_SENDERS' prevent this situation from happening at all? The MTA sending the email is coming from this address: "From: Mail Administrator <postmaster@bellsouth.net>" Do I not understand this parameter correctly?

2. In the situation that is described in the bug report, why don't the

to be used for?

On top of those questions, in our situation I don't know if just changing the 'From' address will help. The ccMail system that I refered to in my last email, changes the From address and replaces it with the Reply-to address (which it completely drops). Which is why the bounce snowball was sent to all users on the dist list because it got changed from <list>-request to just <list>. So we would have wound up in the same situation even if the From address was <list>-owner. Ugly.

I have included the headers as the get changed by the ccMail system for digest emails. The list is test and the domain is chi.mti.com

Normal: Received: from becks (localhost [127.0.0.1]) by becks.chi.mti.com (8.8.8/8.8.8) with ESMTP id UAA17934; Tue, 31 Jul 2001 20:16:02 -0500 (CDT) Date: Tue, 31 Jul 2001 20:16:02 -0500 (CDT) Message-Id: <200108010116.UAA17934@becks.chi.mti.com> From: test-request@chi.mti.com Subject: Test digest, Vol 1 #5 - 5 msgs Reply-to: test@chi.mti.com X-Mailer: Mailman v2.0.3 MIME-version: 1.0 Content-type: text/plain To: test@chi.mti.com Sender: test-admin@chi.mti.com Errors-To: test-admin@chi.mti.com X-BeenThere: test@chi.mti.com X-Mailman-Version: 2.0.3 Precedence: bulk List-Help: <mailto:test-request@chi.mti.com?subject=help> List-Post: <mailto:test@chi.mti.com> List-Subscribe: <http://chi.mti.com/mailman/listinfo/test>, <mailto:test-request@chi.mti.com?subject=subscribe> List-Id: <test.chi.mti.com> List-Unsubscribe: <http://chi.mti.com/mailman/listinfo/test>, <mailto:test-request@chi.mti.com?subject=unsubscribe> List-Archive: <http://chi.mti.com/mailman/private/test/>

ccMail: Received: from bud.chi.mti.com (root@bud [192.107.118.17]) by becks.chi.mti.com (8.8.8/8.8.8) with ESMTP id UAA17958 for <Ramos@chi.mti.com>; Tue, 31 Jul 2001 20:16:14 -0500 (CDT) Received: from mtigate.mti.com (mtigate.mti.com [144.86.1.1]) by bud.chi.mti.com (8.9.3/8.9.3) with ESMTP id UAA18194 for <Ramos@chi.mti.com>; Tue, 31 Jul 2001 20:16:13 -0500 From: test@chi.mti.com Received: from ccmgate.mti.com (ccmgate.mti.com [144.86.14.157]) by mtigate.mti.com (Build 101 8.9.3/NT-8.9.3) with SMTP id SAA28830 for <Ramos@chi.mti.com>; Tue, 31 Jul 2001 18:16:05 -0700 Received: from POP3 Client by ccmgate.mti.com (ccMail Link to SMTP R8.30.00.7) id AA996628767; Tue, 31 Jul 2001 18:19:29 -0700 Message-Id: <0107319966.AA996628767@ccmgate.mti.com> X-Mailer: ccMail Link to SMTP R8.30.00.7 Date: Tue, 31 Jul 2001 20:16:02 -0700 To: <test@chi.mti.com> Subject: Test digest, Vol 1 #5 - 5 msgs MIME-Version: 1.0 Content-Type: multipart/mixed; boundary="simple boundary"