It's not a fluke; I'm still getting these constantly, and almost
certainly due to 'locallowercase'. It may just be coincidence, but
all of these bounces come from either AOL or Hotmail. I'm not sure
what's going on here.
It looks like what's happening is:
1. The mailing list sends the message to a Hotmail/AOL address.
2. Hotmail/AOL accepts the message.
3. Hotmail/AOL sends a message stating the problem (user over quota,
no such user, etc.) back to the address specified by the Reply-To
header. The Reply-To header specifies an address of the format:
<listname>-bounce-<msgnum>-<user>=<remotedomain>@<listdomain>
4. Courier accepts this email, and then sends a test email to the user,
this time with a Reply-To that looks like:
<listname>-bounce1-<random_string>@<listdomain>
5. Hotmail/AOL accepts this test email.
6. Hotmail/AOL sends a reply to the test email, this time to the
address shown in (4).
7. Upon receipt, Courier translates the message sent in (6) to
lowercase, then determines that there is no such address and
bounces the message to the postmaster.
8. The postmaster receives the message.
A sample bounced mail follows:
----- Forwarded message from -----
From: "Courier mail server at neutrino.karmak.org" <@>
Subject: NOTICE: mail delivery status.
To: [EMAIL PROTECTED]
Date: Sat, 28 Sep 2002 02:10:50 +0000
This is a delivery status notification from neutrino.karmak.org,
running the Courier mail server, version 0.39.3.20020823.
The original message was received on Sat, 28 Sep 2002 02:10:50 +0000
from omr-m02.mx.aol.com (omr-m02.mx.aol.com [::ffff:64.12.138.2])
---------------------------------------------------------------------------
UNDELIVERABLE MAIL
Your message to the following recipients cannot be delivered:
<[EMAIL PROTECTED]>:
<<< Invalid address.
---------------------------------------------------------------------------
If your message was also sent to additional recipients, their delivery
status is not included in this report. You may or may not receive
other delivery status notifications for additional recipients.
The original message follows as a separate attachment.
Reporting-MTA: dns; neutrino.karmak.org
Arrival-Date: Sat, 28 Sep 2002 02:10:50 +0000
Received-From-MTA: dns; omr-m02.mx.aol.com (omr-m02.mx.aol.com [::ffff:64.12.138.2])
Final-Recipient: rfc822; [EMAIL PROTECTED]
Action: failed
Status: 5.0.0
Diagnostic-Code: unknown; Invalid address.
From: Mail Delivery Subsystem <[EMAIL PROTECTED]>
Subject: Returned mail: User unknown
To: [EMAIL PROTECTED]
Date: Fri, 27 Sep 2002 22:10:29 -0400 (EDT)
The original message was received at Fri, 27 Sep 2002 22:10:01 -0400 (EDT)
from [204.214.92.213]
*** ATTENTION ***
Your e-mail is being returned to you because there was a problem with its
delivery. The address which was undeliverable is listed in the section
labeled: "----- The following addresses had permanent fatal errors -----".
The reason your mail is being returned to you is listed in the section
labeled: "----- Transcript of Session Follows -----".
The line beginning with "<<<" describes the specific reason your e-mail could
not be delivered. The next line contains a second error message which is a
general translation for other e-mail servers.
Please direct further questions regarding this message to your e-mail
administrator.
--AOL Postmaster
----- The following addresses had permanent fatal errors -----
<[EMAIL PROTECTED]>
----- Transcript of session follows -----
... while talking to air-yb03.mail.aol.com.:
>>> RCPT To:<[EMAIL PROTECTED]>
<<< 550 mel531 IS NOT ACCEPTING MAIL FROM THIS SENDER
550 <[EMAIL PROTECTED]>... User unknown
Reporting-MTA: dns; rly-yb01.mx.aol.com
Arrival-Date: Fri, 27 Sep 2002 22:10:01 -0400 (EDT)
Final-Recipient: RFC822; [EMAIL PROTECTED]
Action: failed
Status: 2.0.0
Remote-MTA: DNS; air-yb03.mail.aol.com
Diagnostic-Code: SMTP; 250 OK
Last-Attempt-Date: Fri, 27 Sep 2002 22:10:29 -0400 (EDT)
From: "Courier Mailing List Manager"
<[EMAIL PROTECTED]>
Subject: Mailing list warning.
To: [EMAIL PROTECTED]
Date: Sat, 28 Sep 2002 02:10:01 +0000
Hello, this is the Courier mailing list manager. I manage the mailing
list <mailto:[EMAIL PROTECTED]>.
There have been problems delivering messages to you from this mailing
list. Your address is not listed in the To: header of this warning
message because all mailing list messages are blind-carbon-copied.
Sometimes this can cause delivery failures because of broken mail
filters, and I want to make sure that this warning message also gets
returned as undeliverable, if this is the case here.
If this warning message is returned as undeliverable, I will then
automatically send you one more probe message. If that message is
also returned as undeliverable, your address will be automatically
removed from the mailing list.
A list of all the undeliverable messages appears below. You may
request any message to be retransmitted by sending a blank message
to <mailto:[EMAIL PROTECTED]>.
Replace N with the message number to retransmit.
Message numbers that were returned as undeliverable:
15
16
A copy of the most recent non-delivery report is attached.
From: Mail Delivery Subsystem <[EMAIL PROTECTED]>
Subject: Returned mail: User unknown
To: [EMAIL PROTECTED]
Date: Wed, 25 Sep 2002 17:06:20 -0400 (EDT)
The original message was received at Wed, 25 Sep 2002 17:06:16 -0400 (EDT)
from [204.214.92.213]
*** ATTENTION ***
Your e-mail is being returned to you because there was a problem with its
delivery. The address which was undeliverable is listed in the section
labeled: "----- The following addresses had permanent fatal errors -----".
The reason your mail is being returned to you is listed in the section
labeled: "----- Transcript of Session Follows -----".
The line beginning with "<<<" describes the specific reason your e-mail could
not be delivered. The next line contains a second error message which is a
general translation for other e-mail servers.
Please direct further questions regarding this message to your e-mail
administrator.
--AOL Postmaster
----- The following addresses had permanent fatal errors -----
<[EMAIL PROTECTED]>
----- Transcript of session follows -----
... while talking to air-xd01.mail.aol.com.:
>>> RCPT To:<[EMAIL PROTECTED]>
<<< 550 mel531 IS NOT ACCEPTING MAIL FROM THIS SENDER
550 <[EMAIL PROTECTED]>... User unknown
Reporting-MTA: dns; rly-xd01.mx.aol.com
Arrival-Date: Wed, 25 Sep 2002 17:06:16 -0400 (EDT)
Final-Recipient: RFC822; [EMAIL PROTECTED]
Action: failed
Status: 5.1.1
Remote-MTA: DNS; air-xd01.mail.aol.com
Diagnostic-Code: SMTP; 550 mel531 IS NOT ACCEPTING MAIL FROM THIS SENDER
Last-Attempt-Date: Wed, 25 Sep 2002 17:06:20 -0400 (EDT)
From: "Pop user by CLI" <[EMAIL PROTECTED]>
Subject: Re: my first time, so be gentle....
To: [EMAIL PROTECTED], [EMAIL PROTECTED]
Date: Wed, 25 Sep 2002 16:05:56 -0500 (CDT)
X-Mailer: Correspond 4.6
Your first time was great, just letting you know that Front Page Deli
is on Franklin St. I will see you guys Friday night.
Angela, From the Deli
----- End forwarded message -----
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