Thanks for detailed explanation.Īlso, I find that the email was sent from email address. So, as I understand, I was looking at the "MX" record which is not the correct one to check for outgoing. The PTR records match perfectly: $ dig +short (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128 verify=NOT) Certainly I am missing this concept whle I am looking at gmail's settings.Īfter reading Answer, Here is what I found:īelow lines are from an email metadata that was received from : Received: from ( )īy with ESMTP id 2edpusg15b-1 Could someone help me understand how reverse lookup is used in SMTP. However, When I casually checked the gmail settings, none of its smtp servers have a matching reverse lookup. I am reading about setting up SMTP server and almost all articles suggest to ensure that the SMTP server's name has a matching reverse lookup (PTR) entry in DNS.
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