We have a lot of old images (like banners) in PoliteMail. For example, some of the banners were not properly sized, so we've added a properly sized banner. Yet the older banners are still available for use since we don't know when they were last used and don't want a recipient to open a previous email without the banner displayed.
For this reason, it would be great to have a way to see when the content was last used. If it was last used over 9 months ago, for example, we might decide it's safe enough to delete the old banner. But if it was used within the last 3 months, we may decide to leave the old banner out there for a while longer.
Thanks for your idea. We will share it with the Development Team!