[ mailman-Bugs-1437581 ] Mailman Auto-unsubscribes Bad Addresses?

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Bugs item #1437581, was opened at 2006-02-23 13:01
Message generated for change (Comment added) made by bascherz
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Category: (un)subscribing
Group: 2.1 (stable)
Status: Open
Resolution: None
Priority: 5
Submitted By: Bruce Scherzinger (bascherz)
Assigned to: Nobody/Anonymous (nobody)
Summary: Mailman Auto-unsubscribes Bad Addresses?

Initial Comment:
I haven't seen any settings for this, and I can only 
describe it based on the information that I have. But 
today I received bounce notices identically 
timestamped for three separate email addresses in the 
same domain. The notices all indicated the addresses 
had been unsubscribed from a specific Mailman list. I 
don't know what initiated the action, and these same 
addresses are still subscribed to other, less-
frequently used lists.

I sent emails directly to the three addresses to 
notify them of the issue, and I got back a response 
from their email server as follows (actual email 
addresses omitted or replaced for privacy reasons):

- - - - - - - - - - - - - - - -
Return-Path: <>
X-Envelope-To: <my_email_address>
X-Spam-Status: No, hits=2.4 required=5.0
	tests=AWL: -0.181,HTML_30_40: 
0.879,HTML_MESSAGE: 0.001,
	MIME_HTML_MOSTLY: 1.54,VIRUS_WARNING268B: 0.2
X-Spam-Level: **
Return-Path: <>
Delivered-To: <my_email_address>
Received: (qmail 29847 invoked by uid 399); 23 Feb 
2006 17:21:13 -0000
X-Virus-Scan: Scanned by clamdmail 0.15 (no viruses);
  Thu, 23 Feb 2006 11:21:13 -0600
Received: from unknown (HELO eastrmmtao06.cox.net) 
(68.230.240.33)
  by mail.opentransfer.com with SMTP; 23 Feb 2006 
17:21:13 -0000
To: <my_email_address> 
From: Mail Administrator <Postmaster at cox.net> 
Reply-To: <Postmaster at cox.net>
Subject: Mail System Error - Returned Mail
Date: Thu, 23 Feb 2006 12:21:06 -0500
Message-ID: <omitted>
MIME-Version: 1.0
Content-Type: multipart/report;
		report-type=delivery-status;
	
	Boundary="===========================_ _= 
9638061(9108)1140715266"


--===========================_ _= 9638061(9108)
1140715266
Content-Type: text/plain 
  
 This Message was undeliverable due to the following 
reason: 
  
 Each of the following recipients was rejected by a 
remote mail server. The reasons given by the server 
are included to help you determine why each recipient 
was rejected.

    Recipient: <addr1 at erols.com>
    Reason:    #5.1.1 bad address addr1 at erols.com

    Recipient: <addr2 at erols.com>
    Reason:    #5.1.1 bad address addr2 at erols.com

    Recipient: <addr3 at erols.com>
    Reason:    #5.1.1 bad address addr3 at erols.com
- - - - - - - - - - - - - - - -

So, all three addresses are bad. Does Mailman 
automatically unsubscribe addresses if it can't 
deliver to them? Or, is there a way to spoof it to 
get it to delete addresses? Is it possible the email 
server (erols.com in this case) can determine that 
there are messages being sent from a Mailman email 
list and send unsubscribe requests to the Mailman 
server to make them stop?

----------------------------------------------------------------------

>Comment By: Bruce Scherzinger (bascherz)
Date: 2006-02-23 13:10

Message:
Logged In: YES 
user_id=1415850

I failed to mention that the webhosting company has 
Mailman v2.1.6 installed.

----------------------------------------------------------------------

You can respond by visiting: 
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