nsg1.namebrightdns.com has no MX records.
Question and response
Question
dig nsg1.namebrightdns.com. MX
Answer
The response has no answer records.
Authority
namebrightdns.com. 1800 SOA chuck.ns.cloudflare.com. dns.cloudflare.com. 2397433036 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0