Question My mailing list emails are bouncing, what does that mean? Answer When the computer attempts to deliver an email to you and it cannot, the email is returned to the sender. This is called a bounce. There are several reasons for an email to bounce. It could be a bad address, a full mailbox, your ISP, or Internet problems. Many of these problems are temporary and will fix themselves. If it continues, contact your ISP (Internet Service Provider). After as few as 3 bounces, your email address will be automatically unsubscribed from the mailing lists. (This is necessary because bouncing mail can wreak havoc on a server). If you have stopped receiving mailings from your list(s), it is generally due to you bouncing off the list. You can re-subscribe to the list, but if you bounce off again, you will need to talk to your ISP about allowing delivery of your mail.