rev.centuria.pl has no MX records.
Question and response
Question
dig rev.centuria.pl. MX
Answer
The response has no answer records.
Authority
rev.centuria.pl. 600 SOA ns1-07.azure-dns.com. linux.centuria.pl. 2021101901 3600 600 1209600 600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0