smtp.simac.com has no NS records.
NS records for this zone are defined at simac.com.
NS records for this zone are defined at simac.com.
Question and response
Question
dig smtp.simac.com. NS
Answer
The response has no answer records.
Authority
simac.com. 3600 SOA ns1.premium-dns.net. hostmaster.simac.com. 2026030501 86400 3600 604800 3600
Additional
. 0 OPT ; payload 1400, xrcode 0, version 0, flags 0