ns2.inea.pl has no MX records.
Question and response
Question
dig ns2.inea.pl. MX
Answer
The response has no answer records.
Authority
inea.pl. 3600 SOA dns.icpnet.pl. root.icpnet.pl. 2026012001 600 300 604800 3600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0