mx1.antel.com.UY has no CNAME records.
Question and response
Question
dig mx1.antel.com.UY. NS
Answer
The response has no answer records.
Authority
antel.com.uy. 1710 SOA portal1.antel.com.uy. seginternet.antel.com.uy. 2026030606 10800 3600 432000 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0