231.110.205.178.in-addr.arpa has no MX records.
Question and response
Question
dig 231.110.205.178.in-addr.arpa. MX
Answer
The response has no answer records.
Authority
110.205.178.in-addr.arpa. 86400 SOA ns.tattelecom.ru. ns2.tattelecom.ru. 2023101600 28800 14400 1814400 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0