18.4.62.in-addr.arpa has no MX records.
Question and response
Question
dig 18.4.62.in-addr.arpa. MX
Answer
The response has no answer records.
Authority
18.4.62.in-addr.arpa. 86400 SOA nsa.online.net. dnsmaster.te-dns.net. 2024120701 28800 7200 604800 86400
Additional
. 0 OPT ; payload 512, xrcode 0, version 0, flags 0