host has no MX records.
Question and response
Question
dig host. MX
Answer
The response has no answer records.
Authority
host. 900 SOA ns0.centralnic.net. hostmaster.centralnic.net. 3000555532 900 1800 6048000 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0