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
  • System Tools > Settings > General > Email usage report
• 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
• Mention and reply
  • Can be disabled in Profile > Edit > Email on mention
• Notification (any item or folder)
  • any user can notify any other user of any item
• Password reset
  • System Tools > Security > General > Allow the "Forgot my Password" feature
• Health warnings