ns2.promdns.net has no MX records.
Question and response
Question
dig ns2.promdns.net. MX
Answer
The response has no answer records.
Authority
promdns.net. 3600 SOA ns.promdns.net. noc.uaprom.net. 2026021901 43200 7200 2419200 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0