ALL A AAAA CAA CNAME MX NS PTR SOA SRV TXT ANY

No ANY records found for mx.srv.dfn.de.

Try srv.dfn.de instead?

id 23603, opcode QUERY, rcode NOERROR, flags QR RD RA
;QUESTION
mx.srv.dfn.de. IN ANY
;ANSWER
;AUTHORITY
dfn.de. 1800 IN SOA ns1.dfn.de. hostmaster.dfn.de. 1746538426 28800 7200 3024000 3600
;ADDITIONAL

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