fmail1.teol.net has no CNAME records.
Question and response
Question
dig fmail1.teol.net. NS
Answer
The response has no answer records.
Authority
teol.net. 300 SOA ns1.teol.net. hostmaster.teol.net. 2026022603 21600 3600 1209600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0