What does the PTR mechanism mean?
When an email receiver gets an email and the PTR mechanism is integrated in the sender’s SPF record, the receiver will look at the incoming IP address and do a “PTR” lookup. For example, if the sender is sending email from IP address 1.2.3.4, the receiver will perform a PTR lookup of 1.2.3.4 to attempt to retrieve a hostname. Lastly, if a hostname is discovered for IP address 1.2.3.4, then that hostname’s domain is compared to the domain that was originally used to lookup the SPF record.
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