nsauth.dn-s.nl has no MX records.
Question and response
Question
dig nsauth.dn-s.nl. MX
Answer
The response has no answer records.
Authority
dn-s.nl. 3600 SOA nsauth.dn-s.nl. nic.virtualregistrar.nl. 2026011901 28800 3600 1209600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0