SharePoint by default will send out all alert emails once every 5 minutes. That's great, except in development you don't wanna wait 5 minutes to see your email changes apply.
Thankfully, there is a way to fix that using the following command -
stsadm -o setproperty -propertyname job-immediate-alerts -url http://yourmosssite -propertyvalue "every 1 minutes between 0 and 59"
The above will start sending these alerts every minute.