169.188.128.174.ntsnetworks.com has no MX records.
Question and response
Question
dig 169.188.128.174.ntsnetworks.com. MX
Answer
The response has no answer records.
Authority
ntsnetworks.com. 300 SOA ns1.networktechnologysolutions.com. support.ntsnetworks.com. 2019112401 28800 7200 1209600 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0