Root cause found, the antagonist.nl domain has 3 listed nameservers:
ns1.antagonist.nl.
ns2.antagonist.net.
ns3.antagonist.de.
but the IP address returned by the actual antagonist.de zone:
ns3.antagonist.de. IN A 139.162.173.192
differs from the glue record returned from the .DE zone:
ns3.antagonist.de. IN A 66.228.42.134
And it is this 66.228.42.134 (returned in the .DE glue) nameserver that is
serving freshly signed denial of existence for _tcp.mx1.p01.antagonist.nl.
--
Viktor.
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