dns.wn-dns.de has no MX records.
Question and response
Question
dig dns.wn-dns.de. MX
Answer
The response has no answer records.
Authority
wn-dns.de. 3600 SOA dns.wn-dns.de. hostmaster\@dns.wn-dns.de. 2023071301 10800 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0