mail.s50.nska.net has no MX records.
Question and response
Question
dig mail.s50.nska.net. MX
Answer
The response has no answer records.
Authority
s50.nska.net. 3600 SOA ns1.nska.net. hostmaster.s50.nska.net. 2025112302 14400 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0