216.151.4.56.fasternetwork.com has no MX records.
Question and response
Question
dig 216.151.4.56.fasternetwork.com. MX
Answer
The response has no answer records.
Authority
fasternetwork.com. 300 SOA ns1.opusinteractive.io. sysadmin.opusinteractive.com. 2026012201 5400 600 1209600 300
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0