First check out the archives of existing newsgroups and mailing lists.
This will give you some idea about volume. One archive is at:
http://asknpac.npac.syr.edu/cgi-bin/news/hypermail_home
A word of caution: this site is undergoing changes right now; yesterday
I was bounced to a chat server when I tried to access it. Today, a
mailing list archive I normally read is not there.
You can also find JavaScript mailing archives at:
http://www.obscure.org/javascript/archives/
This mailing list stopped operation in March, by the way, because it could
not deal with the heavy load.
Try sending e-mail to some mailing list administrators for advice before
attempting one yourself.
Now let's get back to robots.
Gordon Bainbridge
Software Engineer
BASIS Inc