phl-mx-07.messagingengine.com has no CNAME records.
Question and response
Question
dig phl-mx-07.messagingengine.com. NS
Answer
The response has no answer records.
Authority
messagingengine.com. 3387 SOA fmns1.messagingengine.com. postmaster.messagingengine.com. 2026021600 86346 600 1209600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0