ns3.web2go.com.br has no MX records.
Question and response
Question
dig ns3.web2go.com.br. MX
Answer
The response has no answer records.
Authority
web2go.com.br. 14400 SOA web2go.com.br. postmaster.web2go.com.br. 2024051527 10800 3600 604800 14400
Additional
. 0 OPT ; payload 1680, xrcode 0, version 0, flags 0