fmns2.messagingengine.com has no CNAME records.
Question and response
Question
dig fmns2.messagingengine.com. NS
Answer
The response has no answer records.
Authority
messagingengine.com. 3047 SOA fmns1.messagingengine.com. postmaster.messagingengine.com. 2026021600 86346 600 1209600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0