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After following the instructions provided when I subscribed, "To
unsubscribe from the list send E-Mail to listserv@lenti.med.umn.edu with no
subject and one line saying UNSUBSCRIBE VANAGON."
listserv@lenti.med.umn.edu quickly replied with:

At 07:36 PM 1/27/97 -0600, you wrote:
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>Unrecognized request --MIMEMULTIPARTBOUNDARY
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>Report any problems to 'server'.
>For a list of the available requests send a message to
listserv@lenti.med.umn.edu
>with a body consisting of nothing but the word HELP
>
>PS: Any subsequent requests that you might have submitted have been ignored.
>

Tried sending HELP, and tried using Bin Hex and UU and got the same
response each time...
PPS: Any ideas?
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