How can I reduce the number of emails from monitoring a folder?

Monitoring a folder might spam the mailboxes with emails that are generated for every small change. Email notification preferences under the Monitoring sub-tab under My Workspace can be modified to Send Daily Digest Email, which provides a summary of the email alerts.

Go to My Workspace under the SourceForge toolbar
Click on Monitoring
In Edit Monitoring Subscriptions, click on Email notification preference
For each project, the monitoring folders under various components (Tracker/File Releases/Tasks/Discussions/Wiki) can be customized to Daily Digest Email.