Resolving DNS Asynchronously

You're viewing a comment by Abottleinfrontofme Frontallobotomy and its responses.

December 26, 2009, 16:20

It would be nice to be able to edit posts. In my previous post, I meant to say "Reverese - not recursive":

Another interesting DNS topic would be a discussion of reverse DNS resolutions. Taking the IP address and resolving the domain name.

One productive use of reverse DNS mappings is a simple dual authentication method to help thwart spammers. Check if hostname to IP address, and IP address to hostname match. Hostname in this case being the MX record of the sender.

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