ns1.univ.com.br has no MX records.
Question and response
Question
dig ns1.univ.com.br. MX
Answer
The response has no answer records.
Authority
univ.com.br. 3600 SOA dns1.univ.com.br. hostmaster.univ.com.br. 2022103103 3600 1800 1209600 3600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0