fm has no MX records.
Question and response
Question
dig fm. MX
Answer
The response has no answer records.
Authority
fm. 3600 SOA ns0.centralnic.net. itmanager.fsmtc.fm. 301186 900 300 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0