Explained: Email Notifications
Email notifications are fully customizable for each project you've created or joined. There are four notification settings available: Full, Default, Minimal, or None.
Full sends notifications on all newly added content. Default sends notifications when you're specifically assigned a task, milestone, etc, or if new content is added to something you have created. Minimal sends notifications only when you're specifically assigned a task, milestone, etc.
For calendar events, milestones, issues and tasks with due dates we send a reminder 7, 3 and 1 day prior due date and 1 and 8 days on overdue tasks, issues and milestones.
To change these settings navigate to "my account" and click on the "Notifications Settings" tab.