webprovedor.230.rainternet.com.br has no MX records.
Question and response
Question
dig webprovedor.230.rainternet.com.br. MX
Answer
The response has no answer records.
Authority
rainternet.com.br. 3600 SOA ns1.rainternet.com.br. postmaster.rainternet.com.br. 1588611865 3600 600 1209600 3600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0