FAQ
Mailman experts,

We are running Mailman version 2.1.10 on a Centos 5.2 system. Recently a
user sent a RECALL command to one of our lists to retract a message. This
seems to have created an infinite loop relating to bounces.



For some reason something got corrupted, probably related to the Message
ID as shown from one of the log entries below:



Feb 23 11:00:00 2009 (12635) forwarding unrecognized, message-id:
<!~!UENERkVCMDkAAQACALoAAAAAAAAAOKG7EAXlEBqhuwgAKypWwgAAbXNwc3QuZGxsAAAAAABO
SVRB+b+4AQCqADfZbgAAAABDADoAXABEAG8AYwB1AG0AZQBuAHQAcwAgAGEAbgBkACAAUwBlAHQA
dABpAG4AZwBzAFwAZABvAG0AawBlAGsAXABEAGUAcwBrAHQAbwBwAFwAMgAwADAANgAtADAANwBc
AE0AYQBpAGwAXABPAHUAdABsAG8AbwBrAC4AcABzAHQAAAAYAAAAAAAAADxQoBwV+EpCpSL/ibME
zfjCgAAAGAAAAAAAAAA8UKAcFfhKQqUi/4mzBM34RFBLAAAAAAAQAAAAmKK2hHaUmk2V0Gy86is0
y0IAAABbQU5OT1VOQ0VdIEJ1Y2NhbmVlciBXb21lbidzIFNvY2NlciBhbmQgU29mdGJhbGwgIktp
ZHMgTmlnaHQgT3V0IgA=@beloit.edu>







I get one of these bounce messages about every 10 minutes or so. This is
not a pending message. So what might be going wrong and how do I clean up
the list so that the request stops bouncing? Is there some file I can empty
out?



Tim Tyler

Network Engineer

Beloit College

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  • Mark Sapiro at Feb 24, 2009 at 3:40 pm

    Tim Tyler wrote:
    We are running Mailman version 2.1.10 on a Centos 5.2 system. Recently a
    user sent a RECALL command to one of our lists to retract a message. This
    seems to have created an infinite loop relating to bounces.



    For some reason something got corrupted, probably related to the Message
    ID as shown from one of the log entries below:



    Feb 23 11:00:00 2009 (12635) forwarding unrecognized, message-id:
    <!~!UENERkVCMDkAAQACALoAAAAAAAAAOKG7EAXlEBqhuwgAKypWwgAAbXNwc3QuZGxsAAAAAABO
    SVRB+b+4AQCqADfZbgAAAABDADoAXABEAG8AYwB1AG0AZQBuAHQAcwAgAGEAbgBkACAAUwBlAHQA
    dABpAG4AZwBzAFwAZABvAG0AawBlAGsAXABEAGUAcwBrAHQAbwBwAFwAMgAwADAANgAtADAANwBc
    AE0AYQBpAGwAXABPAHUAdABsAG8AbwBrAC4AcABzAHQAAAAYAAAAAAAAADxQoBwV+EpCpSL/ibME
    zfjCgAAAGAAAAAAAAAA8UKAcFfhKQqUi/4mzBM34RFBLAAAAAAAQAAAAmKK2hHaUmk2V0Gy86is0
    y0IAAABbQU5OT1VOQ0VdIEJ1Y2NhbmVlciBXb21lbidzIFNvY2NlciBhbmQgU29mdGJhbGwgIktp
    ZHMgTmlnaHQgT3V0IgA=@beloit.edu>







    I get one of these bounce messages about every 10 minutes or so. This is
    not a pending message. So what might be going wrong and how do I clean up
    the list so that the request stops bouncing? Is there some file I can empty
    out?

    Each one of these is a new message sent to the LISTNAM-bounces address
    and forwarded to the list owner as an unrecognized bounce. I'm only
    guessing, and this doesn't make much sense, but RECALL is an nntp
    command so somehow some news server is repeatedly sending this command
    to the list until it gets a response. Maybe it will eventually give up?

    If this is really a loop involving Mailman, you could turn off
    bounce_unrecognized_goes_to_list_owner, and that should stop it, but I
    doubt this is the issue.

    Check your MTA log and see where these messages are coming from.

    --
    Mark Sapiro <mark at msapiro.net> The highway is for gamblers,
    San Francisco Bay Area, California better use your sense - B. Dylan
  • Kirke Johnson at Feb 24, 2009 at 4:54 pm
    Mark, I believe the RECALL command is an Outlook/Exchange horror that
    does not play well with many "normal" email systems.

    http://office.microsoft.com/en-us/outlook/HA010917601033.aspx
    At 07:40 AM 2/24/2009, you wrote:

    Each one of these is a new message sent to the LISTNAM-bounces address
    and forwarded to the list owner as an unrecognized bounce. I'm only
    guessing, and this doesn't make much sense, but RECALL is an nntp
    command so somehow some news server is repeatedly sending this command
    to the list until it gets a response. Maybe it will eventually give up?

    If this is really a loop involving Mailman, you could turn off
    bounce_unrecognized_goes_to_list_owner, and that should stop it, but I
    doubt this is the issue.

    Check your MTA log and see where these messages are coming from.

    --
    Mark Sapiro <mark at msapiro.net> The highway is for gamblers,
    San Francisco Bay Area, California better use your sense - B. Dylan

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    Kirke Johnson Internet: kjohnson at pcc.edu
    Email Administrator, TSS , Sylvania Campus http://www.pcc.edu/
    Portland Community College, Portland, OR, USA (503) 977-4368
  • Mark Sapiro at Feb 24, 2009 at 6:06 pm

    Kirke Johnson wrote:
    Mark, I believe the RECALL command is an Outlook/Exchange horror that
    does not play well with many "normal" email systems.

    http://office.microsoft.com/en-us/outlook/HA010917601033.aspx

    That makes much more sense. Thanks for the info.

    --
    Mark Sapiro <mark at msapiro.net> The highway is for gamblers,
    San Francisco Bay Area, California better use your sense - B. Dylan

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