117.119.133.31.in-addr.arpa has no MX records.
Question and response
Question
dig 117.119.133.31.in-addr.arpa. MX
Answer
The response has no answer records.
Authority
119.133.31.in-addr.arpa. 3600 SOA ns.enterra.dp.ua. admin.enterra.dp.ua. 2021042301 28800 7200 1209600 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0