news.admin.net-abuse.blocklisting - join
Discussion of ip-based blocklisting. (Moderated)
Low activity, 754 subscribers, Usenet

alt.spam - join
What is that stuff that doth jiggle in the breeze?
Low activity, 254 subscribers, Usenet

comp.mail.sendmail - join
Configuring and using the BSD sendmail agent.
Low activity, 1397 subscribers, Usenet