mail.mailgrid.pl has no NS records.
NS records for this zone are defined at mailgrid.pl.
NS records for this zone are defined at mailgrid.pl.
Question and response
Question
dig mail.mailgrid.pl. NS
Answer
The response has no answer records.
Authority
mailgrid.pl. 1800 SOA lynn.ns.cloudflare.com. dns.cloudflare.com. 2395780210 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0