tutorial - How to use SPAM Blacklists (Public) With Sendmail

There are many publicly available lists of known open mail relay servers and spam generating mail servers on the Internet. Some are maintained by volunteers, others are managed by public companies

You can configure sendmail to use its dnsbl feature to both query these lists and reject the mail if a match is found. Here are some sample entries you can add to your /etc/sendmail.mc file; they should all be on one line.

FEATURE(`dnsbl', `ipwhois.rfc-ignorant.org',`"550 Mail from " $&{client_addr} " refused. Rejected for bad WHOIS info on IP of your SMTP server - see http://www.rfc-ignorant.org/“‘)
FEATURE(`dnsbl', `proxies.blackholes.easynet.nl', `"550 5.7.1 ACCESS DENIED to OPEN PROXY SERVER "$&{client_name}" by easynet.nl DNSBL  (http://proxies.blackholes.easynet.nl/errors.html)”‘, `’)dnl
FEATURE(`dnsbl', `relays.ordb.org', `"550 Email rejected due to sending server misconfiguration - see http://www.ordb.org/faq/#why_rejected“‘)dnl
FEATURE(`dnsbl', `bl.spamcop.net', `"450 Mail from " $`'&{client_addr} " refused - see http://spamcop.net/bl.shtml“‘)
FEATURE(`dnsbl',`sbl.spamhaus.org',`Rejected - see http://spamhaus.org/’)dnl

Be sure to visit the URLs listed to learn more about the individual services.



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source:http://linuxpoison.blogspot.com/2007/10/13578175808731.html

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