Our data indicates emBlue supports DMARC compliance via DKIM.
Contact emBlue support for DKIM configuration or visit the following page: https://help.embluemail.com/primeros-pasos/configuracion-de-los-registros-spf-y-dkim/
emBlue's SPF include is 'include:_spf.emblueuser.com', however our data doesn't indicate they support DMARC compliance via SPF. For more information, contact emBlue directly.