ns2.proxad.net has no MX records.
Question and response
Question
dig ns2.proxad.net. MX
Answer
The response has no answer records.
Authority
proxad.net. 86400 SOA ns0.proxad.net. hostmaster.proxad.net. 2026020401 21600 3600 1209600 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0