Gmail to handle al e-mails for that domain

I am preparing the configuration of the e-mail for a domain that makes use of gmail to handle al e-mails for that domain. At this moment the MX records of the domain refer to the Google aspmx.l.google.com url.
I can modify the MX records to refer to the Protector public IP but how to configure the Protector to send e-mail to the google SMTP servers? I cannot find any guide on the Secpoint website explaining this.

 Yes. In theory, on the Protector you must simply configure as mail server the current MX record, then point the MX record to the Protector.

Is the Protector configured with aspmx.l.google.com as mail server?