40.198.217.178.revdns.city-net.pl has no MX records.
Question and response
Question
dig 40.198.217.178.revdns.city-net.pl. MX
Answer
The response has no answer records.
Authority
city-net.pl. 10800 SOA fns1.42.pl. freedns-admin+145272.42.pl. 2100101272 86400 10800 3600000 10800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0