If the main guide for Troubleshooting Alert Emails in SharePoint (WSS/MOSS) doesn’t help you solve the problem then you may find the answer in one of these posts – come back and post a comment and I’ll update the guide for others.

Alerts in Windows SharePoint Services

Microsoft official documentation – Alerts Overview, Default timer interval, predefined alert templates …

How to Troubleshoot Alerts in WSS 3.0 / MOSS

The most common issue in alert is the user will get the initial email, but will not get when changes are made to the list where he configured the alert.  Check the following …

How to troubleshoot Alerts in SharePoint

had built this farm a little over a year ago and all of the sudden, alerts stopped working…. This is happening to everyone… both new and old alerts.

Troubleshooting MOSS Alerts

“Alert not working” is the most common issue in MOSS. People tend to forget the basic troubleshooting and jump directly into advance troubleshooting…

Alerts in SharePoint (Troubleshooting MOSS/WSS)

I think one of the most reported and popular issues within SharePoint Server 2007 / WSS

MOSS Alerts – Error Troubleshooting

When setting up MOSS Alerts or Tasks you get the following error:

The following users do not have e-mail addresses specified: Username. Alerts have been created successfully but these users will not receive e-mail notifications until valid e-mail addresses have been provided