ns1.mirasystem.net has no MX records.
Question and response
Question
dig ns1.mirasystem.net. MX
Answer
The response has no answer records.
Authority
mirasystem.net. 3600 SOA ns0.mirasystem.net. admins.mirasystem.net. 453 900 600 86400 3600
Additional
. 0 OPT ; payload 1680, xrcode 0, version 0, flags 0