Dan, I am sending this to you and to the list because it explains a lot.

At 07:48 AM 4/23/97 -0700, you wrote:
>try resubscribing (listserv@lenti.med.umn.edu) ... sometimes the ISP
>folks take the thing down overnight for testing or whatever, and if a
>message bounces back to the listserv for the list, the listserv will
>drop you off (to prevent flooding of the list with bounced error
>messages).
>
>ddf
Thank you.  I did get a bounced message (Someone's mailbox was full).  I
have now re-send my original SUBSCRIBE (just before you suggested it) and
messages from the list are now coming in.  Jim.