esnsupport.dnsalias.net has no MX records.
Question and response
Question
dig esnsupport.dnsalias.net. MX
Answer
The response has no answer records.
Authority
dnsalias.net. 600 SOA ns1.dyndns.org. hostmaster.dyndns.org. 2220098629 600 300 604800 600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0