extsmtp172.ecomz.net has no MX records.
Question and response
Question
dig extsmtp172.ecomz.net. MX
Answer
The response has no answer records.
Authority
ecomz.net. 180 SOA ns20.digicertdns.com. dns.digicertdns.com. 2009014917 43200 3600 1209600 180
Additional
. 0 OPT ; payload 1280, xrcode 0, version 0, flags 0