mail01.digecog.gob.do has no CNAME records.
Question and response
Question
dig mail01.digecog.gob.do. NS
Answer
The response has no answer records.
Authority
digecog.gob.do. 1512 SOA dns40.midominio.do. yocaren.nivar.digecog.gob.do. 2025111701 7200 7200 172800 38400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0