mail.apropo.org.pe has no CNAME records.
Question and response
Question
dig mail.apropo.org.pe. NS
Answer
The response has no answer records.
Authority
apropo.org.pe. 365 SOA dns3.unired.net.pe. hostmaster.unired.net.pe. 2019032466 28800 7200 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0