mail3.itmfs.com has no NS records.
NS records for this zone are defined at itmfs.com.
NS records for this zone are defined at itmfs.com.
Question and response
Question
dig email3.itmems4.com. NS
Answer
The response has no answer records.
Authority
itmems4.com. 1800 SOA amy.ns.cloudflare.com. dns.cloudflare.com. 2396944958 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0