mx2.jfc.dev has no CNAME records.
Question and response
Question
dig mx2.jfc.dev. NS
Answer
The response has no answer records.
Authority
jfc.dev. 881 SOA ns-743.awsdns-28.net. awsdns-hostmaster.amazon.com. 1 7200 900 1209600 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0