host50.net-city.net has no MX records.
Question and response
Question
dig host50.net-city.net. MX
Answer
The response has no answer records.
Authority
net-city.net. 3600 SOA ns2.net-city.net. admin.net-city.net. 2025072913 10800 600 1209600 3600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0