ns1.itservice4u.pl has no MX records.
Question and response
Question
dig ns1.itservice4u.pl. MX
Answer
The response has no answer records.
Authority
itservice4u.pl. 3600 SOA dns1.itservice4u.pl. hostmaster.itservice4u.pl. 2025120301 900 600 86400 3600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0