On 7/17/19 8:18 PM, Mark Sapiro wrote: > On 7/17/19 4:23 PM, David Andrews wrote: >> I run an installation that has over 300 lists. Normally, for years, I >> received around 300 uncaught bounce notifications a day. In the past >> couple of months, it has dramatically increased to 3000 to 4000 a day. >> Some questions: what causes them? Can they be reduced? Do they hurt >> anything? Toes the increase mean a problem somewhere else? > > Most likely (you can tell by looking at them) they are spam sent to the > listname-bounces address. They might also be out of office type > responses sent by non compliant (RFC 5230) vacation programs or replies > to list mail erroneously sent to the envelope sender. > > What causes them is any message sent to a listname-bounces address that > is not recognized as a delivery status notification by Mailman's bounce > processing. At this point actual unrecognized DSNs are very rare, but if > the message looks like a DSN and is unrecognized, you can post it here, > and we will try to update the recognizers to recognize it. > > You can set a list's Bounce processing -> > bounce_unrecognized_goes_to_list_owner to No to eliminate the notices > from that list, but then you will miss any real bounces which are > unrecognized if there are any. > > The only harm is the extra mail to deal with. > > The increase is probably due to an increase in spam possibly due to > various listname-bounces addresses getting on more spammers lists. > Here is a sample of one semi-regular bounce I get from a list I manage (I haved X'ed out the personal information included in the bounce). I suspect that one issue is that this is a bounce message, not a server refusing (thus they are probably back-scattering), and the bounce doesn't give the address that the message was sent to (though it is in the Delivered-To: header of the message that bounced that I trimmed).
Also, being a 'I think your a spammer' as opposed to 'That address isn't valid' message says I am not sure one really wants to count it as a bounce. (pair.com/pairlist.net is my service provider, arlingtonlist.org is the domain for the mailing list, osiris.978.org is their domain) Return-Path: <> X-Original-To: [email protected] Delivered-To: [email protected] Received: from arjuna.pair.com (arjuna.pair.com [209.68.5.131]) by six.pairlist.net (Postfix) with ESMTP id D07DAA5F67 for <[email protected]>; Tue, 2 Jul 2019 08:30:16 -0400 (EDT) Received: (qmail 91008 invoked by uid 3409); 2 Jul 2019 12:30:16 -0000 Delivered-To: rdamon-arlingtonlist:[email protected] Received: (qmail 91002 invoked from network); 2 Jul 2019 12:30:16 -0000 Received: from mailwash50.pair.com (66.39.2.216) by arjuna.pair.com with ESMTPS (DHE-RSA-AES256-GCM-SHA384 encrypted); 2 Jul 2019 12:30:16 -0000 Received: from localhost (localhost [127.0.0.1]) by mailwash50.pair.com (Postfix) with SMTP id 710361322815 for <[email protected]>; Tue, 2 Jul 2019 08:30:16 -0400 (EDT) X-Virus-Check-By: mailwash50.pair.com Received: from localhost (localhost [127.0.0.1]) by mailwash50.pair.com (Postfix) with SMTP id 65CD31322778 for <[email protected]>; Tue, 2 Jul 2019 08:30:15 -0400 (EDT) Received: from osiris.978.org (osiris.978.org [98.110.203.122]) by mailwash50.pair.com (Postfix) with SMTP for <[email protected]>; Tue, 2 Jul 2019 08:30:11 -0400 (EDT) Received: (qmail 28339 invoked by uid 1000); 2 Jul 2019 08:30:09 -0400 Date: 2 Jul 2019 08:30:09 -0400 Message-ID: <[email protected]> From: [email protected] To: <[email protected]> Subject: failure notice In-Reply-To: <[email protected]> References: <[email protected]> Hi. This is the bounce program. I'm afraid I've been instructed to return your message. It was refused by the recipient's junk mail controls. To reach XXXXXXXXXXX, please telephone +1 888 XXXXXXX. --- Below this line is a copy of the message. -- Richard Damon ------------------------------------------------------ Mailman-Users mailing list [email protected] https://mail.python.org/mailman/listinfo/mailman-users Mailman FAQ: http://wiki.list.org/x/AgA3 Security Policy: http://wiki.list.org/x/QIA9 Searchable Archives: http://www.mail-archive.com/mailman-users%40python.org/ Unsubscribe: https://mail.python.org/mailman/options/mailman-users/archive%40jab.org
