On 6/25/24 12:51, Jim Dory wrote:
2. SMTP: Reverse DNS doesn't match SMTP Banner (The SMTP banner issued by your email server did not contain the hostname we resolved for your server’s IP address.)
#2 - Reverse DNS - I have PTR records set for both compute.nkc.com (abbreviated) and nkc.com. So that could be a problem?
DNS is Evil. A host should not have more than one PTR because if it does, it's not clear which PTR will be returned by the nameserver. Ditto for A record, becasue teh one PTR can only match one of those -- but with something like unbound that doesn't support CNAMEs, you won't have much choice. And if you do have CNAMEs, the client has to do extra work to find the A and match it to the PTR -- if it cares.
I'm guessing they are flagging it because it *should* be playing nice and sending its A hostname that has a corresp. (one) PTR record, in the SMTP banner.
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