Much spam passing current postfix UCE filters and landing in the INBOX are from IP addresses that do not resolve to a domain name. The headers include a 'Received: from <some_domain_name> (unknown [nnn.ooo.ppp.qqq])'.
Is the unknown IP address a reliable indicator of spam? A Web search did not answer this question. One hit, to an Apple mail forum, suggested that it can be the result of some (many?) Mac admins not correctly configuring their DNS servers. Might adding a rule to reject unknown IP addresses produce unintended consequences of rejecting legitimate non-maillist messages? Rich _______________________________________________ PLUG mailing list [email protected] http://lists.pdxlinux.org/mailman/listinfo/plug
