Great Circle Associates List-Managers
(June 2002)

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Subject: Re: re-appearing old mail?
From: James M Galvin <galvin @ acm . org>
Date: Sat, 15 Jun 2002 13:57:25 -0400 (EDT)
To: Byron Lunz <bklunz @ databack . com>
Cc: list-managers @ greatcircle . com
In-reply-to: <5 . 0 . 2 . 1 . 2 . 20020615081242 . 02e1b9c0 @ 204 . 245 . 195 . 28>

More generally, I see this a lot from Microsoft Exchange users.

There is an obscure anomaly for which users who set the "vacation"
notice feature will cause all messages that have collected since the
notice was set to be resubmitted the moment they login when they get
back from "vacation".

It's pretty easy to detect if you log message-ids of received messages.
This is what I do.  Can you say "looping storm"?  You only need this to
happen once, on a b-i-g list, to understand why I remove with prejudice
any subscriber who submits duplicate messages.

You can also find them when the envelope from does not match the message
header from.

The resubmitted message will look exactly like the original except that
it will have more Received lines and the envelope from will be the
person with the broken mail system.


James M. Galvin <galvin @
 acm .

On Sat, 15 Jun 2002, Byron Lunz wrote:

    Date: Sat, 15 Jun 2002 08:17:18 -0700
    From: Byron Lunz <bklunz @
 databack .
    To: list-managers @
 greatcircle .
    Subject: re-appearing old mail?

    Is anyone else seeing the re-appearance of old messages on discussion lists
    (or just old messages re-appearing in their inbox)?

    I've had a couple of listowners question why old messages, seen 4 or 5 days
    ago, suddenly reappeared on their lists. Upon investigation, the only
    common element I noticed was that each such message had numerous Received:
    headers, one of which was from Examples from three different messages:

      Received: from ( [])
      Received: from ( [])
      Received: from [] by with

    It looks to me like one or more mail servers are regurgitating old
    messages, which then are treated as new posts upon arrival at our
    mailserver. Is anyone else seeing this problem or know for sure the source
    of these mails?

    Byron Lunz
    DataBack Systems LLC

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