FAQ
Hello,

Last month we started to provide a MailMan (version 2.1.5) list for
Public Libraries in Wisconsin. Sending messages with binary attachments
(like Excel files) to MailMan lists with Eudora 6 seems to be
problematic. The problem does not occur in testing with Netscape or
Mozilla email clients. Many of our list subscribers stated that the
attachment had become part of the text message as a large random table
of text. Here is a sample of the problem:

--=====================_209060==_
Content-Type: application/octet-stream; name="filename.xls";
x-mac-type="584C5334"; x-mac-creator="5843454C"
Content-Transfer-Encoding: base64
Content-Disposition: attachment; filename="filename.xls"
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Has anyone experienced this before? Any help or suggestions would be
greatly appreciated.

Thank you,

Dave Bacon - OWLS

--
_________________________________________

Dave G. Bacon
Computer Network Manager
Outagamie Waupaca Library System
225 N. Oneida St., Appleton, WI 54911
920/832-6193(voice), 920/832-6422(FAX)
mailto:dbacon at mail.owls.lib.wi.us
http://www.owls.lib.wi.us
_________________________________________

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  • Mark Sapiro at Aug 31, 2004 at 1:08 am

    Dave Bacon wrote:
    Sending messages with binary attachments
    (like Excel files) to MailMan lists with Eudora 6 seems to be
    problematic. The problem does not occur in testing with Netscape or
    Mozilla email clients. Many of our list subscribers stated that the
    attachment had become part of the text message as a large random table
    of text. Here is a sample of the problem:

    --=====================_209060==_
    Content-Type: application/octet-stream; name="filename.xls";
    x-mac-type="584C5334"; x-mac-creator="5843454C"
    Content-Transfer-Encoding: base64
    Content-Disposition: attachment; filename="filename.xls"

    0M8R4KGxGuEAAAAAAAAAAAAAAAAAAAAAPgADAP7/CQAGAAAAAAAAAAAAAAABAAAAHgAAAAAAAAAA
    EAAA/v///wAAAAD+////AAAAAB0AAAD/////////////////////////////////////////////
    ////////////////////////////////////////////////////////////////////////////
    <snip>

    This is exactly what a MIME base64 encoded attachment looks like in a
    raw message. The question is - is it being seen this way because the
    recipient's MUA doesn't recognize the MIME format or because the
    overall MIME structure of the message has been corrupted somewhere
    along the way. Whether or not the MIME structure is corrupted cannot
    be answered from your excerpt. You'd have to see the entire raw
    message including the main headers and the sub-part headers to
    determine that. However, if SOME list subscribers see the attachment
    as an attachment, and they're not all using the same broken MUA, then
    the problem is likely in the MUA's of the people who don't see the
    attachment as such.

    OTOH, if all or almost all recipients see the raw base64 part as above,
    then the structure of the message is probably being corrupted and
    Mailman may or may not be involved in this. The fact that it only
    happens with messages from Eudora 6 might implicate Eudora, but it's
    hard to say. I just tested sending a message with an attached binary
    file from Eudora 5.2 through Mailman 2.1.4 and the attachment came
    through as it should.

    --
    Mark Sapiro <msapiro at value.net> The highway is for gamblers,
    San Francisco Bay Area, California better use your sense - B. Dylan
  • Brad Knowles at Aug 31, 2004 at 2:00 am

    At 6:08 PM -0700 2004-08-30, Mark Sapiro wrote:

    OTOH, if all or almost all recipients see the raw base64 part as above,
    then the structure of the message is probably being corrupted and
    Mailman may or may not be involved in this. The fact that it only
    happens with messages from Eudora 6 might implicate Eudora, but it's
    hard to say. I just tested sending a message with an attached binary
    file from Eudora 5.2 through Mailman 2.1.4 and the attachment came
    through as it should.
    I use Eudora 6 myself, and I've never seen problems like this
    when posting messages with attachments through mailing lists that
    allow them. I've never had anyone complain that the resulting
    message munged, either.

    I doubt the problem is with Eudora. There might be a
    mis-configured MTA somewhere along the line, however.

    --
    Brad Knowles, <brad at stop.mail-abuse.org>

    "Those who would give up essential Liberty, to purchase a little
    temporary Safety, deserve neither Liberty nor Safety."

    -- Benjamin Franklin (1706-1790), reply of the Pennsylvania
    Assembly to the Governor, November 11, 1755

    SAGE member since 1995. See <http://www.sage.org/> for more info.

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