The dns query that is being sent is an IPv6 type=aaaa. Meaning they want to know the IPv6 IP address of the domain of the sender
Rejecting for missing IPv6 records causes a lot of (nothing but?) false positives.
. Our dns is not setup to resolve IPv6 queries so it sends NXDOMAIN, or NonExistantDomain. And the message get bounced by their antispam software saying "Domain does not exist"
Your DNS works fine. Let him burn in his self-inflicted, false-positive hell. There is no requirement to have IPv6 records to send Internet mail. Does he say you are the only mail server being rejected for not having IPv6 records?
Len
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