Subject: Re: email SPAM
To: None <current-users@NetBSD.ORG, firstname.lastname@example.org>
From: Peter Seebach <email@example.com>
Date: 05/28/1997 08:05:25
I've been looking into this a fair amount.
There are several good rulesets on the sendmail.org web pages. Basically,
here's what you want to do:
1. You can have a check_mail rule which refuses mail from invalid
domains, and also refuses mail from any number of domains you distrust.
2. You can have a check_rcpt rule which refuses any mail that comes
from a remote system, and is to a remote system; this prevents spammers
from using your mailer to get around someone else's mailblocks.
Real Soon Now there will be more pointers to this on my web page,
for now, http://spam.abuse.net/ has some good pointers.