subscriber.voipinternetcable.com has no MX records.
Question and response
Question
dig subscriber.voipinternetcable.com. MX
Answer
The response has no answer records.
Authority
voipinternetcable.com. 86400 SOA ns01.momentumtelecom.com. sysops.momentumtelecom.com. 2019042809 28800 7200 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0