ns1.cittatelecom.net.br has no MX records.
Question and response
Question
dig ns1.cittatelecom.net.br. MX
Answer
The response has no answer records.
Authority
cittatelecom.net.br. 300 SOA ns1.cittatelecom.net.br. hostmaster.cittatelecom.net.br. 2025112401 7200 1800 1209600 300
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0