1f5818dde0
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
81 lines
3.3 KiB
Plaintext
81 lines
3.3 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 rulesets to /etc/sendmail.cf, check_rcpt,
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check_relay, check_rbl, check_mail and xlat. (xlat is for testing
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only, as explained in /etc/mail/sendmail.cf.additions.) These
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rulesets use three databases. The denyip, a list of IP addresses,
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spamsites, a list of domains, and fakenames, a list of bogus
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usernames (such as investor and success). We do not accept mail
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from any machine that matches a entry in either database, or usersr
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in the fakenames 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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Nov 30 15:56:37 hub sendmail[15058]: PAA15058: ruleset=check_mail,
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arg1=<ultramax@s2.eddelwissl.NET>, relay=relay.somewhere.com
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[###.###.###.###], reject=451 <ultramax@s2.eddelwissl.NET>... Domain
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does not resolve
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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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check_rcpt reject:
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Nov 30 15:04:08 hub sendmail[12390]: PAA12390: ruleset=check_rcpt,
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arg1=investor@100percent.per.year.com, relay=newfed.frb.gov
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[198.3.221.5], reject=553 investor@100percent.per.year.com...
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521<investor@100percent.per.year.com>#blocked.contact postmaster
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Sun Nov 16 11:40:53 PST 1997
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