Robert Heller wrote: > If the machine is a public-facing smtp server, I would look first to see > if you are getting the problem I was having. Maybe looking at the > maillog to see if the volume of incoming mail is just overwhelming the > system. In which case you need to do things to keep sendmail from > running to many processes, either by throttling the connection rate and/or > be using the accessdb to discard or reject connection from known problem > networks. > Very simple solution is to implement Reverse DNS check. My Postfix mail server refuses to accept any mail from FQDN without valid reverse DNS. I (was?) also use graylisting and few other measures, but Reverse DNS helped immensely in lowering SPAM that comes to my mailboxes. I would say that reduction is some 70-80%. Ljubomir