Right now, it could be a list of all invitations that come from non-google domains. I assume they could do better than that over time, but my point is that "de

Right now, it could be a list of all invitations that come from non-google domains. I assume they could do better than that over time, but my point is that "decline and log for review" is an option whenever "decline alone" is. On review, you could whitelist the false positives.