also known as transactive email. A creative format where the recipient can enter a transaction in the body of the email itself without clicking to a web page first. Transactions may be answering a survey, or purchasing something.

Building a Highly-targeted Opt in List: When Money Lies Beneath the Lists
Are you successful with your Internet business? Better yet, do you think you are successful with your online business? When most online entrepreneurs are asked with these questions, they often brush it off.