Hi Eduardo,
A correct Office 365 MX record is like: yourdomain.mail.protection.outlook.com. To narrow down the issue, at least we should add this correct MX record at domain registrar. However if the issue persist after adding this record, please post back and we will provide a further troubleshoot.
Best Regards,
April Zhou
A correct Office 365 MX record is like: yourdomain.mail.protection.outlook.com. To narrow down the issue, at least we should add this correct MX record at domain registrar. However if the issue persist after adding this record, please post back and we will provide a further troubleshoot.
Best Regards,
April Zhou