mail.eclit.com has no NS records.
NS records for this zone are defined at eclit.com.
NS records for this zone are defined at eclit.com.
Question and response
Question
dig mail.eclit.com. NS
Answer
The response has no answer records.
Authority
eclit.com. 1800 SOA brit.ns.cloudflare.com. dns.cloudflare.com. 2398780286 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0