mx25.personal.com.py has no CNAME records.
Question and response
Question
dig mx25.personal.com.py. NS
Answer
The response has no answer records.
Authority
personal.com.py. 3382 SOA ns1.personal.net.py. omonges.personal.com.py. 2026021801 7200 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0