> These options include rejecting, quarantining, or delivering email with modifications. For example, you can route mail to Gmail and an external server or set policies that vary by organizational unit.
That way Gmail becomes a single point of failure like any other service; you will only lose the mail which didn't arrive during the outage, which will then usually be resent at a later time. But you wouldn't care that much if they lock you out, since you then can change the MX records to point to the external server.
https://support.google.com/a/answer/6297084?hl=en
> These options include rejecting, quarantining, or delivering email with modifications. For example, you can route mail to Gmail and an external server or set policies that vary by organizational unit.
That way Gmail becomes a single point of failure like any other service; you will only lose the mail which didn't arrive during the outage, which will then usually be resent at a later time. But you wouldn't care that much if they lock you out, since you then can change the MX records to point to the external server.