You should NEVER do a 'FOR userid SIGNOFF * (NETWIDE' for more than a
handful of users. Each request causes a one-liner to be forwarded to 260+
servers (via DISTRIBUTE), and the processing overhead can be tremendous
if you do that for massive amounts of userids (say, 1000 or more). For
large amounts of users you should build a netwide DELETE job with the
list of accounts to unsubscribe and submit it to LISTSERV (wildcards are
now supported, which may or may not be useful to you). Please refer to
the 1.6e release notes in the LSTSRV-M archives for guidelines on netwide
DELETE jobs.
Eric