mxwww.amris.com has no NS records.
NS records for this zone are defined at amris.com.
NS records for this zone are defined at amris.com.
Question and response
Question
dig mxwww.amris.com. NS
Answer
The response has no answer records.
Authority
amris.com. 1800 SOA asa.ns.cloudflare.com. dns.cloudflare.com. 2397057898 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0