mta03.correowebseguro.com has no MX records.
Question and response
Question
dig mta03.correowebseguro.com. MX
Answer
The response has no answer records.
Authority
correowebseguro.com. 300 SOA dns15.ovh.net. tech.ovh.net. 2025121900 86400 3600 3600000 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0