8.140.205.178.in-addr.arpa has no MX records.
Question and response
Question
dig 8.140.205.178.in-addr.arpa. MX
Answer
The response has no answer records.
Authority
140.205.178.in-addr.arpa. 86400 SOA ns.tattelecom.ru. ns2.tattelecom.ru. 2025052101 28800 14400 1814400 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0