isp.servpersosystems.net has no MX records.
Question and response
Question
dig isp.servpersosystems.net. MX
Answer
The response has no answer records.
Authority
isp.servpersosystems.net. 60 SOA ns2-ipam.servperso.net. noc.servperso.net. 1771666204 172800 900 1172800 60
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0