Much like autoresponders, triggered emails are emails that are send out after someone completes an action - in other words, they are trigger based. You can set a triggered email up to be stand alone, or one of a series that will be sent out at a set time after a person subscribes to your contact list or completes an action. A triggered campaign can be set to 'trigger,' based on several criteria, including (but not limited to) a date, a recipient opening a campaign, or a recipient clicking on a link within a campaign.
For example, you can set up an autoresponder to be sent immediately (0 hours) after the person signs up to let them know about a promotion you are having for new users. You could then set up one to be sent 72 hours later see how they felt about your offer.
SEE Trigger Emails that Drive Revenues - click here