Maybe, one other thing where this would have to have a shortcircuited is when I initiate the contact, so that people responding would not get hit by this, even if their reply is the first e-mail from them sent to my server. So it should be fairly smart.
Sadly, I'd imagine some users don't really have a choice, e.g., an employee whose company is using Gmail from G Suite for its email, so, it'd be an uphill battle for sure.