I have a list that is years old. People come and go, but the list is still thousands strong. The problem is I don't think they are reading what I send them. About 10% open the emails , at least the ones I can track. Several bounce but only a very small percentage each time. Some come back as "mailbox full".
What are the rest doing? They don't open the email, their mailbox is not full, they don't unsubscribe, they don't bounce.
If I weed the list I might only get 10% back. I can't decide if that's a good thing or not. I suppose some people will open the emails weeks or months later. I don't want to miss those.