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FedoraNEWS: HOWTO: How to Block Spam Using DNSBL

Apr 25, 2005, 08:30 (2 Talkback[s])
(Other stories by Thomas Chung)

[ Thanks to Thomas Chung for this link. ]

"A DNS-based Blackhole List, or DNSBL, is a means by which an Internet site may publish a list of IP addresses, in a format which can be easily queried by computer programs on the Internet. As the name suggests, the technology is built on top of the Internet DNS or Domain Name System. DNSBLs are chiefly used to publish lists of addresses linked to spamming. Most mail transport agent (mail server) software can be configured to reject or flag messages which have been sent from a site listed on one or more such lists.

"In this article, I'll discuss how you can configure sendmail using DNSBL to block E-Mail Spam on a mail server running on Fedora Core..."

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