223.52.92.in-addr.arpa has no MX records.
Question and response
Question
dig 223.52.92.in-addr.arpa. MX
Answer
The response has no answer records.
Authority
223.52.92.in-addr.arpa. 600 SOA ns4.zerotimeservices.com. alert.zerotimeservices.com. 2026013001 3600 1800 1209600 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0