Here's the Error Reports tab:



On this tab you can see all error reports. Here's a part of the same dialog box but with two error reports of which the first one is selected:



You can open selected messages by clicking on the button labeled View. To delete messages, select them and click Delete. You can also click Delete All to remove all expired messages.

Below these buttons, there's one more labeled Unsubscribe. Using this button you can remove subscribers from all databases by entering their email addresses on the dialog box that will show up when you click on the button.