Zimbra Enable PTR/Reverse DNS lookup Incoming Email

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A reverse DNS lookup or reverse DNS resolution (rDNS) is the querying of the Domain Name System (DNS) to determine the domain name associated with an IP address – the reverse of the usual "forward" DNS lookup of an IP address from a domain name.
Step 1: Enable zimbraMtaRestriction as command below
su - zimbra
zmprov mcf +zimbraMtaRestriction "reject_unknown_client_hostname"

 Step 2: zimbra postfix reload
postfix reload

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