Three signals at once. This mailbox opened twice last quarter, then went quiet for 74 days. Decay, not death. The domain moved mailbox providers in April, so the old reputation does not carry over. And subscribers who joined the same way, same webinar, have started marking us spam. A validator sees none of it. Do not suppress yet. Move this cohort into a re-engagement flow, pull what they opened and how they signed up, and let their next real click decide. Silent through the flow too, then suppress.