static.bellmts.net has no MX records.
Question and response
Question
dig static.bellmts.net. MX
Answer
The response has no answer records.
Authority
static.bellmts.net. 900 SOA dns1.mts.net. dnsadmin.bellmts.net. 103 10800 3600 2419200 900
Additional
. 0 OPT ; payload 1220, xrcode 0, version 0, flags 0