Tutorials
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Reverse DNS
May 1, 2006
Reverse DNS (rDNS) is a method of resolving an IP address into a domain name, just as the domain name system (DNS) resolves
domain names into associated IP addresses. One of the applications of reverse DNS is as a spam filter.
Here's how it works: Typically, a spammer uses an invalid IP address, one that doesn't match the domain name.
A reverse DNS lookup program inputs IP addresses of incoming messages to a DNS database. If no valid name is found to
match the IP address, the server blocks that message.
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