ns2.yipi.com.br has no MX records.
Question and response
Question
dig ns2.yipi.com.br. MX
Answer
The response has no answer records.
Authority
yipi.com.br. 3600 SOA ns1.yipi.com.br. admin.yipi.com.br. 2025123100 3600 7200 1209600 3600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0