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66 lines
2.7 KiB
Plaintext
66 lines
2.7 KiB
Plaintext
Filtering out SPAM from your site
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Introduction:
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The FreeBSD Project filters spam, unsolicited commerical
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e-mail, from its mailing lists. The filter has two parts: databases
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and rulesets. We have added three rulesets to /etc/sendmail.cf,
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check_relay and check_mail and xlat. (xlat is for testing only, as
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explained in /etc/mail/sendmail.cf.additions.) These rulesets use
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two databases. The denyip, a list of IP addresses, and spamsites,
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a list of domains. We do not accept mail from any machine that
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matches a entry in either database.
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Filtering at your site:
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To filter spam at your site you need to:
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1. modify your /etc/sendmail.cf,
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2. retrieve the database source files from the master site,
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3. make the databases and
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4. finally signal sendmail that the configuration file has changed.
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1. Modifying your /etc/sendmail.cf
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Add the database declarations and the rulesets contained
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in /etc/mail/sendmail.cf.additions to your .mc file. If you do
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not use m4 to generate your /etc/sendmail.cf, add the database
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declarations to your /etc/sendmail.cf.
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2. Fetching the database source files:
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The database source files are available from Gulf Coast
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Internet via anonymous FTP. The Makefile in /etc/mail will retreive
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the source files for you: as root, type "cd /etc/mail; make" at
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the command line. The previous version of the database source
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files is moved to <filename>.0. Local additions should be kept in
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separate files. We use spamsites.local and denyip.local. You may
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want to diff the new versions of the files against the previous
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versions to see what has changed.
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3. Make the databases:
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As root, type "cd /etc/mail; make install" will build the
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two databases from the retrieved source files and the local additions
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files.
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4. Signaling sendmail:
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Sendmail will reread its configuration whenever sendmail
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receives a HUP signal. As root, type "kill -HUP `cat
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/var/run/sendmail.pid`". Check sendmail's log file to be sure that
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it has restarted. /var/log/maillog should contain the line: "Oct
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15 08:59:16 hub sendmail[6565]: restarting /usr/sbin/sendmail on
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signal". Most likely, the date, time, hostname and process id will
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be differ.
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Testing the spam filter:
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How can I tell if its working:
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The mail log file, /var/log/maillog, will contain a line
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for every message filtered. The lines will be similar to one of
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these two log entries:
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Check_mail rejects:
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"Oct 15 02:43:26 hub sendmail[6565]: CAA06565: ruleset=check_mail,
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arg1=<announce@martianconsulate.com>, relay=xxx.isp.net [###.###.###.###],
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reject=521 <announce@martianconsulate.com>"
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Check_relay rejects:
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Oct 19 04:45:24 hub sendmail[3503]: NOQUEUE: ruleset=check_relay,
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arg1=imsp015.netvigator.com, arg2=205.252.144.206, relay=root@localhost,
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reject=521 blocked.contact postmaster@FreeBSD.ORG
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