No ANY records found for mail.dns1.de.
Try dns1.de instead?
id 12783, opcode QUERY, rcode NXDOMAIN, flags QR RD RA ;QUESTION mail.dns1.de. IN ANY ;ANSWER ;AUTHORITY dns1.de. 900 IN SOA anycast.regdns1.de. hostmaster.partnergate.com. 2025042304 28800 7200 604800 900 ;ADDITIONAL
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