Is there some way to set up a filter so everyone in the world doesn't
get messages from the list with UNSUBSCRIBE in the subject line?  This
seems to me to be the one biggest source of noise from the list.  Maybe
a filter with UNSUBSCRIBE cut out to those on the list and an automated
response that told the sender how to unsubscribe?

I don't know how much control the users have on MIT's list server, so
if this is impossible just ignore it.

Roger