Until recently I told people, in my list's banner, to use shortcuts such
as the following to subscribe/signoff.

To signoff the EDI-L list,  mailto:[log in to unmask]
To subscribe,               mailto:[log in to unmask]

Apparently listserv.net is not on the network as a valid host, though
there still is a Whois record for the domain name.  I realize that this
may have been an unsupported service.
  Rich Hintz