What is RDNS used for?

asked Oct 5, 2012 in General by Maria (1,020 points)
Hello there,

How would using RDNS benefit me? I have a big amount of emails being sent to and from my server and was wondering is RDNS can improve the performance of my email traffic?
Any advice?


1 Answer

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answered Oct 5, 2012 by lightSpeed (2,420 points)
RDNS (Reverse DNS) is used to find out the hostnames associated with specific IP addresses. It must reside on the name servers set as the owner of a specific IP/Netblock.
It is important to use a RDNS zone if have mail being sent from the server because most ISP's reject mail from  servers if there is no RDNS zone for the IP address.