|This is a good resource, but I don't think it answers Scott's question,
|which I think is:  If we see someone spamming LISTSERV-based mailing lists,
|is there something we should do to notify the LISTSERV network that this is
|going on, or do we just count on LISTSERV's spam-detectors to do that for
|us?

Is there anything the LISTSERV(R) maintainer can do that exceeds the
POSTMASTER when it comes to spam?

Assuming that you have a static RFC822 address, the maintainer can issue

SERVE rfc822_address OFF

/Pete