42.222.77.in-addr.arpa has no MX records.
Question and response
Question
dig 42.222.77.in-addr.arpa. MX
Answer
The response has no answer records.
Authority
42.222.77.in-addr.arpa. 600 SOA ns1.sweb.ru. postmaster.sweb.ru. 2020123655 28800 7200 604800 600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0