Sometimes Yahoo! Alerts email messages are not successfully delivered, which results in the email being returned to Yahoo!. This is called an email "bounceback." If messages sent to a particular email address repeatedly bounce back, Yahoo! automatically suspends any alerts going to that address.

Here are some common reasons why emails bounce back:

• The address we are trying to send to is not valid. To check the email address we have on file for you, go to Account Info and make any appropriate changes.
• The email address we are sending to has reached its storage quota. If you use Web-based email services like Hotmail or Yahoo! Mail, make sure your inbox is not full. If it's full, we can't send you email.