mail2.mav.com.br has no MX records.
Question and response
Question
dig mail2.mav.com.br. MX
Answer
The response has no answer records.
Authority
mav.com.br. 1200 SOA ns1.supramail.com.br. suporte.supramail.com.br. 2016032318 10800 3600 604800 3600
Additional
. 0 OPT ; payload 2800, xrcode 0, version 0, flags 0