mailgate.ghostservices.net has no CNAME records.
Question and response
Question
dig mailgate.ghostservices.net. NS
Answer
The response has no answer records.
Authority
ghostservices.net. 1712 SOA emily.ns.cloudflare.com. dns.cloudflare.com. 2397346603 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0