mail.sbarailcloud.com has no NS records.
NS records for this zone are defined at sbarailcloud.com.
NS records for this zone are defined at sbarailcloud.com.
Question and response
Question
dig mail.sbarailcloud.com. NS
Answer
The response has no answer records.
Authority
sbarailcloud.com. 1800 SOA danica.ns.cloudflare.com. dns.cloudflare.com. 2394608721 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0