What's happening is that your mail to MSN is bouncing. (Common problem
with MSN.) When the number of 'errors' reaches a certain number the
listserv software unsubscribes you so as to not send mail to invalid
addresses.

What you need to do is reset the bounce counter and complain to
Micro$oft about the bouncing messages.  I'm sure that you can get the
instructions for resetting the counter by sending a message to
<mailto:listserv@gerry.vanagon.com> with the word HELP in the message
body.  That should cause gerry to send you the command list.

Jim