107.167.242.54.optk.com has no MX records.
Question and response
Question
dig 107.167.242.54.optk.com. MX
Answer
The response has no answer records.
Authority
optk.com. 600 SOA ns33.domaincontrol.com. dns.jomax.net. 2026021301 28800 7200 604800 600
Additional
. 0 OPT ; payload 1280, xrcode 0, version 0, flags 0