ns_dcweb06.itf.edu.br has no MX records.
Question and response
Question
dig ns_dcweb06.itf.edu.br. MX
Answer
The response has no answer records.
Authority
itf.edu.br. 3600 SOA ns1-35.azure-dns.com. hostmaster.franciscanos.net. 2018071360 1200 600 1209600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0