qsmtp.metricstream.com has no NS records.
NS records for this zone are defined at metricstream.com.
NS records for this zone are defined at metricstream.com.
Question and response
Question
dig qsmtp.metricstream.com. NS
Answer
The response has no answer records.
Authority
metricstream.com. 1800 SOA elle.ns.cloudflare.com. dns.cloudflare.com. 2398198122 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0