gw.hoztnode.net has no MX records.
Question and response
Question
dig gw.hoztnode.net. MX
Answer
The response has no answer records.
Authority
hoztnode.net. 799 SOA dns1.hoztnode.net. wheel.hoztnode.net. 4 7200 900 1209600 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0