ns0.carrier.cloud has no MX records.
Question and response
Question
dig ns0.carrier.cloud. MX
Answer
The response has no answer records.
Authority
carrier.cloud. 38400 SOA ns0.carrier.cloud. admin.carrier.cloud. 1520614923 10800 3600 1209600 38400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0