nsauth.myrootnet.com has no MX records.
Question and response
Question
dig nsauth.myrootnet.com. MX
Answer
The response has no answer records.
Authority
myrootnet.com. 585 SOA nsauth.myrootnet.com. root.rootnet.nl. 2026021901 14400 3600 1209600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0