cpanel.cronostelecom.com.br has no MX records.
Question and response
Question
dig cpanel.cronostelecom.com.br. MX
Answer
The response has no answer records.
Authority
cronostelecom.com.br. 86400 SOA cpsp01.volare.host. root.volare.host. 2024121201 3600 1800 1209600 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0