mail.grl.cl has no CNAME records.
Question and response
Question
dig mail.grl.cl. NS
Answer
The response has no answer records.
Authority
grl.cl. 10800 SOA ns3.hostmar.com. root.hostmar.com. 2025081400 28800 7200 2000000 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0