nsauth.dn-s.eu has no MX records.
Question and response
Question
dig nsauth.dn-s.eu. MX
Answer
The response has no answer records.
Authority
dn-s.eu. 300 SOA nsauth.dn-s.eu. hostmaster.dn-s.eu. 2026011603 600 3600 1209600 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0