impala.n0x.net has no MX records.
Question and response
Question
dig impala.n0x.net. MX
Answer
The response has no answer records.
Authority
n0x.net. 3600 SOA impala.n0x.net. matt.n0x.net. 1637964723 3600 600 1209600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0