This is the action you would like to take if no reciprocated link is found after X number of attempts the application has made to look for it (the previous setting). If the suspend listing box is checked, the listing will be removed from the live directory and will have it's status set to "suspended" in the link management area (you will also receive an email letting you know this has happened). If you also leave the "Send Email" box checked, the "Link Not Found" email will be sent to the link partner. If you don't want them to get this email, you can leave that box unchecked.