It's really important to be able to clean our lists regularly from inactive/uninterested/unengaged contacts. MailChimp has it, and I think it's critically important. I understand the "Did Not Open" and "Bounced" reporting currently available, and I also understand we can export contacts from different campaigns and try to clean them up with pivot tables and so forth. However, as a highly touted and respected mailing list management service, this requested feature is a MUST for those of us really trying to stay ahead of the game. We do not want to pester people with emails they aren't interested in receiving, and I hate the idea of sending out an email asking them if they still want to be on our list (since most of them probably will never open that email). Thank you for consideration.