mail.nic.CL has no CNAME records.
Question and response
Question
dig mail.nic.CL. NS
Answer
The response has no answer records.
Authority
nic.CL. 900 SOA a.nic.CL. dnsadmin.nic.CL. 2026030219 21600 7200 2592000 900
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0