nsdc2.arise.pl has no MX records.
Question and response
Question
dig nsdc2.arise.pl. MX
Answer
The response has no answer records.
Authority
arise.pl. 900 SOA nsdc1.arise.pl. dnsadmin.arise.pl. 2026012901 10800 3600 1209600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0