dynamic.guam.net has no MX records.
Question and response
Question
dig dynamic.guam.net. MX
Answer
The response has no answer records.
Authority
dynamic.guam.net. 3600 SOA NS.guam.net. HostMaster.ns.guam.net. 2011052402 3600 3600 3600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0