Hugh,
The difference is whether mail from that list is sent via
DISTRIBUTE or not. If it is, then there will be only one To: address
per mail file, and the mail will come from LISTSERV@<some LISTSERV
close to CUA>. If it isn't, then there will be up to 5 addresses per
file, and the mail will come from LISTSERV@<peer you're susbcribed
to>.
Ross Patterson
Rutgers University