Bill Verity at "LISTSERV site administrators' forum" <[log in to unmask]> wrote on 09/13/2006 03:26:14 PM: > We plan to run Spamassasin on our listserv machine to identify spam > as soon as we have a faster machine. Question is what to do with it > after it is identified. Our thought is to simply reject any mail > that scores "high" from spamassassin. The value of high is yet to be > determined. This may make spamcop at little happier, but probably > not enough to keep us off their list. Define "reject." Return it to the alleged sender? Are you going to discard the message? Return a permanent SMTP error code? The last is only possible if you score it while the SMTP connection is open. The spam filter (based on a sendmail's milter API) I use does the third option. The first option will get you blacklisted for backscatter spam. The second choice is the best bet if you can't use #3, but false positives will get lost.