_mail.dhosting.pl has no MX records.
Question and response
Question
dig _mail.dhosting.pl. MX
Answer
The response has no answer records.
Authority
_mail.dhosting.pl. 900 SOA ns1.dhosting.pl. admin.dhosting.pl. 2022072900 21600 7200 1209600 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0