71.192.in-addr.arpa has no MX records.
Question and response
Question
dig 71.192.in-addr.arpa. MX
Answer
The response has no answer records.
Authority
71.192.in-addr.arpa. 300 SOA ns1.resilans.se. registry.resilans.se. 2026012132 7200 1800 604800 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0