mail.aifrad.edu.do has no CNAME records.
Question and response
Question
dig mail.aifrad.edu.do. NS
Answer
The response has no answer records.
Authority
aifrad.edu.do. 8291 SOA ns2.aifrad.edu.do. gregoryderosario.gmail.com. 2026021507 10800 3600 1209600 10800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0