mx1.maternacz.com has no CNAME records.
Question and response
Question
dig mx1.maternacz.com. NS
Answer
The response has no answer records.
Authority
maternacz.com. 281 SOA ns1.comverga.com. support.comverga.com. 2025110300 600 600 86400 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0