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26da30bbbc
break each ruleset into identified sections. (called groups).
note which groups can be reordered.
each group accepts and returns the same strings,
as much as possible.
reactivate Paul Vixie's RBL (in check_mail)
add rules to limit mail relaying to a list of hosts and domains
in the R class (check_rcpt, not active on hub.freebsd.org)
Submitted by: jmb
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| aliases | ||
| Makefile | ||
| README | ||
| sendmail.cf.additions | ||
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 usersr in the fakenames database. Filtering at your site: To filter spam at your site you need to: 1. modify your /etc/sendmail.cf, 2. retrieve the database source files from the master site, 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. Fetching the database source files: The database source files are available from Gulf Coast Internet via anonymous FTP. The Makefile in /etc/mail will retreive the source files for you: as root, type "cd /etc/mail; make" at the command line. The previous version of the database source files is moved to <filename>.0. Local additions should be kept in separate files. We use spamsites.local and denyip.local. You may want to diff the new versions of the files against the previous versions to see what has changed. 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