On 12/14/2017 10:09 AM, Ryan Prihoda wrote:
What I was saying is FCrDNS /that /important to fail delivery when the others are readily available to verify ?
I think that the importance of FCrDNS, and of setting FCrDNS up with a PTR record ending with the sender's PRIMARY domain name (or at least using an important domain - not some throwaway or utility domain - so that both identity AND that domain's "good reputation" is properly attributed to the IP) - has received far too little attention over the years.
SPF, DMARC, and DKIM get so much attention - but FCrDNS is at least as important! Most likely, those espousing SPF, DMARC, and DKIM probably just assume that everyone already knows to do FCrDNS - but there are still many mail admins out there who haven't implemented FCrDNS, or haven't implemented it optimally.
-- Rob McEwen
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