sepharadmail.domaku.com has no NS records.
NS records for this zone are defined at domaku.com.
NS records for this zone are defined at domaku.com.
Question and response
Question
dig sepharadmail.domaku.com. NS
Answer
The response has no answer records.
Authority
domaku.com. 1767 SOA ns1.nodoxy.com. hostmaster.domaku.com. 2026031500 10800 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0