mail.hostingnet.cl has no CNAME records.
Question and response
Question
dig mail.hostingnet.cl. NS
Answer
The response has no answer records.
Authority
hostingnet.cl. 5846 SOA cl.hnc.cl. root.vps.hostingnet.cl. 2026012900 3600 1800 1209600 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0