ms.info.serasa.com.br has no MX records.
Question and response
Question
dig ms.info.serasa.com.br. MX
Answer
The response has no answer records.
Authority
serasa.com.br. 3600 SOA segateway01.serasa.com.br. resptecti.serasa.com.br. 2025100701 10800 3600 1814400 7200
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0