About Triggers
You can set up a trigger to automatically send a message if (or when) certain conditions are met. For example, you can create a trigger that sends a birthday message to each customer a week before their birthday, or sends a follow-up email for a specified period of time after a customer clicks a link on a web page.
Creating a Trigger Part 1: Getting Started
Creating a Trigger Part 2: Choosing a Trigger Type
Creating a Trigger Part 3: Final Steps (Creating a Message, Editing Your Logic Statement)
About Trigger Logic Statements
Changing the Logic of a Trigger
Creating Triggers: Some Examples
Scheduling a Trigger for Delivery
Enabling and Disabling a Trigger