mx2.myottmail.com has no CNAME records.
Question and response
Question
dig mx2.myottmail.com. NS
Answer
The response has no answer records.
Authority
myottmail.com. 56 SOA pdns05.domaincontrol.com. dns.midmaine.com. 2019100402 28800 7200 604800 600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0