mx4.saxobank.com has no CNAME records.
Question and response
Question
dig mx4.saxobank.com. NS
Answer
The response has no answer records.
Authority
saxobank.com. 5001 SOA edns4.ultradns.com. premiumdns.support.neustar. 2019053769 28800 7200 1209600 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0