mx.eccb.net has no CNAME records.
Question and response
Question
dig mx.eccb.net. NS
Answer
The response has no answer records.
Authority
eccb.net. 3092 SOA ns1.ipage.com. dnsadmin.ipage.com. 2018051269 10800 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0