mail1.comunitel.net has no CNAME records.
Question and response
Question
dig mail1.comunitel.net. NS
Answer
The response has no answer records.
Authority
comunitel.net. 600 SOA ns1.comunitel.net. hostmaster.comunitel.net. 2024112900 43200 7200 2419200 600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0