Additional thought on this topic. I would like to suggest that CD reconsider providing a way for a client to automate clearing of blocked emails. It adds more administrative overhead to maintain lists and submit tickets on a regular basis. Why not have some mechanism in the application to indicate (such as button on the contact) that the email listed be removed from CD's service protection list. If it requires some sort of validation (to make sure email is good and sender reputation protected), then why not add it.
Incidentally, in a certain case recently, the contact was receiving emails, but then blocked. The messages on the soft bounce show 'Status = 5.0.0 (undefined status) | Diag = smtp;500 Line too long'. So, someone is receiving and opening emails, but still recording soft bounces, and they end up getting excluded, and we have to jump through hoops just to fix it. I understand the need to protect ClickDimensions sender reputation, but it should be easier to clear things out in the application if proper actions taken. I am sure you guys could come up with something.