The List Sorcerer Enterprise System will attempt delivery to a subscriber several times prior to considering it a failed mail piece. Once this has happened the subscriber will be routed to the failed mail section shown below.

The activities that may be performed using the tool bar are as follows:
Delete - select this option to permanently remove this subscriber from your campaign.
Tracking - displays the complete transcript of activities and events that pertain to the selected subscriber
Re-Activate - routes the selected subscriber back into the active subscribers list therefore resetting the failed mail status and once again making it viable for delivery attempt.