fmns1.messagingengine.com has no CNAME records.
Question and response
Question
dig fmns1.messagingengine.com. NS
Answer
The response has no answer records.
Authority
messagingengine.com. 2849 SOA fmns1.messagingengine.com. postmaster.messagingengine.com. 2026021600 86346 600 1209600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0