ns4.nease.net has no MX records.
Question and response
Question
dig ns4.nease.net. MX
Answer
The response has no answer records.
Authority
nease.net. 60 SOA ns4.nease.net. admin.nease.net. 998254 36000 3000 3600000 60
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0