mail.fornex.org has no NS records.
NS records for this zone are defined at fornex.org.
NS records for this zone are defined at fornex.org.
Question and response
Question
dig mail.fornex.org. NS
Answer
The response has no answer records.
Authority
fornex.org. 300 SOA ns1.fornex.com. hostmaster.fornex.com. 2772658744 46800 1800 3600000 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0