xtemp-144-0-rev.fmservers.net has no MX records.
Question and response
Question
dig xtemp-144-0-rev.fmservers.net. MX
Answer
The response has no answer records.
Authority
fmservers.net. 3600 SOA n1.os-ns.com. hostmaster.fmservers.net. 2025071605 3600 3600 1209600 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0