Emails can be sent in the following 5 ways:

• Subscriptions (per user)
  • My Profile > Edit > What's New > Subscription
  • System Tools > People > [USER] > What's New > Subscription
• Auto notifications (per folder)
  • Administration > Auto Notification
  • (supported folder application types only)
• Workflow (per folder)
  • Workflow Tab
  • (supported folder application types only)
• Memo manger (per site)
  • System application
• Notification (any item or fodler)
  • any user can notify any other user of any item