dynamic.fuse.net has no MX records.
Question and response
Question
dig dynamic.fuse.net. MX
Answer
The response has no answer records.
Authority
dynamic.fuse.net. 900 SOA ns1.fuse.net. hostmaster.fuse.net. 414 10800 3600 2419200 900
Additional
. 0 OPT ; payload 1220, xrcode 0, version 0, flags 0