E-mail occasionally bounces for a variety of reasons including a computer or network disruption, or a full mailbox. For users whose e-mail bounces continuously, their subscription will be terminated on the belief that the e-mail address is no longer valid. The e-mail address is placed on a special mailing list called Bounces. Once a day, for five days, a message is sent to users on the list notifying them of the situation. Information listing each mailing list a user was subscribed as well as how to re-subscribe is included in the message. After five days, the e-mail address is removed from the mailing list entirely. To receive the mailing list again, users will be required to re-subscribe.