smtp2164.mkhostings.com has no MX records.
Question and response
Question
dig smtp2164.mkhostings.com. MX
Answer
The response has no answer records.
Authority
mkhostings.com. 300 SOA ns3.1-hostingservice.com. domains.1-hostingservice.com. 2025052309 3600 60 604800 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0