mail.scalematrix.net has no MX records.
Question and response
Question
dig mail.scalematrix.net. MX
Answer
The response has no answer records.
Authority
scalematrix.net. 600 SOA pdns05.domaincontrol.com. dns.jomax.net. 2018101801 28800 7200 604800 600
Additional
. 0 OPT ; payload 1280, xrcode 0, version 0, flags 0