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MX record needs to have a valid PTR record

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Is there any requirement that MX record needs to have a valid PTR record?

 

e.g. an MX record: mx.domain.com resolves 1.1.1.1 in addition the IP address(1.1.1.1) needs to have a PTR record that resolves back tomx.domain.com.

 

Thanks in advance.




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