mail.eohcloud.co has no CNAME records.
Question and response
Question
dig mail.eohcloud.co. NS
Answer
The response has no answer records.
Authority
eohcloud.co. 10488 SOA ns1.ensync.net. dns-admin.ensync.co.za. 2025120800 7200 7200 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0