mail.geomatica.edu.do has no CNAME records.
Question and response
Question
dig mail.geomatica.edu.do. NS
Answer
The response has no answer records.
Authority
geomatica.edu.do. 300 SOA ns1.bluehost.com. root.sh00557.bluehost.com. 2026030200 86400 7200 3600000 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0