Shopping Cart abandonment
Visitors who started but have not completed the checkout process are closer to making a purchasing decision. Studies have shown that you can increase conversion rates by as much as 48% if you follow up with potential customers who abandoned the checkout process. Don't give up on them so easily. Visit http://www.intentree.com.au/cart-abandonment.html
Customize one or more email templates, decide when they should go out and emails will be triggered automatically based on your definitions.
You can set up multiple campaigns with different offers. This way you can offer a promotion in the second email, only to those users who have not responded to the first email.
Send different emails to different customers based on their order value or cart content.