mail80.jackcars.com.ar has no CNAME records.
Question and response
Question
dig mail80.jackcars.com.ar. NS
Answer
The response has no answer records.
Authority
jackcars.com.ar. 4187 SOA ns9.hostmar.com. root.hostmar.com. 2025081400 28800 7200 2000000 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0