When silence means remove.
The three emails only work because something happens at the end of them. Without a sunset, the stop question is a bluff, the removal date is decoration, and the campaign is one more broadcast to people who stopped reading — which is the exact problem it was supposed to solve.
Why removal is the point
Mailbox providers decide where your mail lands using how the people you send to behave. Continuing to send to a large group who never open, never click and never reply teaches the providers that your mail can safely be ignored, and that judgement is then applied to everybody — including the readers who would have opened. Removing the silent contacts is not a punishment for them. It is protection for the relationship you still have with everyone else. Deliverability basics covers the sending domain, authentication and complaint side of the same problem.
There is a second reason, and it is the one that makes the decision concrete rather than theoretical: an inactive contact is not free. Marketing platforms price on the number of people you can market to, so a third of a list that stopped reading two years ago is a third of a bill paid every month for silence.
Removed from marketing is not deleted
The objection to sunsetting is almost always the same: these are people who bought from us, attended something, sat in a course. The answer is that removing somebody from active marketing does not have to remove them from the business. The customer record, the purchase history, the course access and the receipts all stay. What stops is marketing email — and the policy below says that explicitly so nobody has to relitigate it next quarter.