mf-01.ipserverone.com has no MX records.
Question and response
Question
dig mf-01.ipserverone.com. MX
Answer
The response has no answer records.
Authority
ipserverone.com. 900 SOA ns1.ipserverone.com. cllee.ipfusions.com. 2024011568 7200 1800 1209600 900
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0