mailmxa.azteca-comunicaciones.com has no CNAME records.
Question and response
Question
dig mailmxa.azteca-comunicaciones.com. NS
Answer
The response has no answer records.
Authority
azteca-comunicaciones.com. 101 SOA ns41.domaincontrol.com. dns.jomax.net. 2025120900 28800 7200 604800 600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0