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# $Id: README,v 1.5 1998/09/02 01:34:57 brian Exp $ Filtering out SPAM from your site Introduction: The FreeBSD Project filters spam, unsolicited commerical e-mail, from its mailing lists. The filter has two parts: databases and rulesets. We have rulesets to /etc/sendmail.cf, check_rcpt, check_relay, check_rbl, check_mail and xlat. (xlat is for testing only, as explained in /etc/mail/sendmail.cf.additions.) These rulesets use three databases. The denyip, a list of IP addresses, spamsites, a list of domains, and fakenames, a list of bogus usernames (such as investor and success). We do not accept mail from any machine that matches a entry in either database, or users in the fakenames database. Filtering at your site: To filter spam at your site you need to: 1. modify your /etc/sendmail.cf, 2. create a list of domains/ips you wish to block 3. make the databases and 4. finally signal sendmail that the configuration file has changed. 1. Modifying your /etc/sendmail.cf Add the database declarations and the rulesets contained in /etc/mail/sendmail.cf.additions to your .mc file. If you do not use m4 to generate your /etc/sendmail.cf, add the database declarations to your /etc/sendmail.cf. 2. Put the list of domains you wish to block in /etc/mail/spamsites 3. Make the databases: As root, type "cd /etc/mail; make install" will build the two databases from the retrieved source files and the local additions files. 4. Signaling sendmail: Sendmail will reread its configuration whenever sendmail receives a HUP signal. As root, type "kill -HUP `cat /var/run/sendmail.pid`". Check sendmail's log file to be sure that it has restarted. /var/log/maillog should contain the line: "Oct 15 08:59:16 hub sendmail[6565]: restarting /usr/sbin/sendmail on signal". Most likely, the date, time, hostname and process id will be differ. Testing the spam filter: How can I tell if its working: The mail log file, /var/log/maillog, will contain a line for every message filtered. The lines will be similar to one of these two log entries: Check_mail rejects: Oct 15 02:43:26 hub sendmail[6565]: CAA06565: ruleset=check_mail, arg1=<announce@martianconsulate.com>, relay=xxx.isp.net [###.###.###.###], reject=521 <announce@martianconsulate.com> Nov 30 15:56:37 hub sendmail[15058]: PAA15058: ruleset=check_mail, arg1=<ultramax@s2.eddelwissl.NET>, relay=relay.somewhere.com [###.###.###.###], reject=451 <ultramax@s2.eddelwissl.NET>... Domain does not resolve Check_relay rejects: Oct 19 04:45:24 hub sendmail[3503]: NOQUEUE: ruleset=check_relay, arg1=imsp015.netvigator.com, arg2=205.252.144.206, relay=root@localhost, reject=521 blocked.contact postmaster@FreeBSD.ORG check_rcpt reject: Nov 30 15:04:08 hub sendmail[12390]: PAA12390: ruleset=check_rcpt, arg1=investor@100percent.per.year.com, relay=newfed.frb.gov [198.3.221.5], reject=553 investor@100percent.per.year.com... 521<investor@100percent.per.year.com>#blocked.contact postmaster Sun Nov 16 11:40:53 PST 1997