Member Avatar for shahab.burki

Hi,
Why email servers use reverse DNS Mappings?

Thanks
Shahab

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  • Latest Post Latest Post by sknake
Member Avatar for freshfitz

I believe to authenticate for spam by using a dual look-up, IP to name and name to IP. I know aol will reject if it's not setup by your isp

Member Avatar for sknake

I believe to authenticate for spam by using a dual look-up, IP to name and name to IP. I know aol will reject if it's not setup by your isp

Some ISPs check reverse DNS just as freshfitz states. The advantage is most spam is sent from infected machines on DSL networks so they cannot control their DNS, thus they can't spam AOL. It's a check that would not be needed if SPF were fully implemented on mail servers but we're still waiting for that day to come.

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