mail.ufinet.com.co has no CNAME records.
Question and response
Question
dig mail.ufinet.com.co. NS
Answer
The response has no answer records.
Authority
ufinet.com.co. 2773 SOA ns1.ufinetlatam.net. noclatam.ufinet.com. 2023011901 28800 7200 1209600 10800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0