smtp.sbarailnetwork.com has no NS records.
NS records for this zone are defined at sbarailnetwork.com.
NS records for this zone are defined at sbarailnetwork.com.
Question and response
Question
dig smtp.sbarailnetwork.com. NS
Answer
The response has no answer records.
Authority
sbarailnetwork.com. 1800 SOA danica.ns.cloudflare.com. dns.cloudflare.com. 2394600965 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0