What this tells you
How much of the user’s received email is from external senders, and whether that is unusually different from their own recent baseline.
What this can’t tell you
Does not indicate harmful intent, unsafe decisions, or whether the user actively chose risky behaviour. This is largely an exposure and context measure.
How we describe it
Shows how much of the user’s received email is from external senders, and whether that pattern differs unusually from their normal recent baseline.