Pre-pay for "email credits." We deduct 1 credit for each recipient you send to.
Email credits carry over, and never expire. You only pay for what you use.
There really aren't any catches. ESP works like a pre-paid phone card. You just pre-purchase the number of credits you need, then use them only when you need to. You don't have to use all your credits every time you use ESP, because they "roll over" and never expire. Yes, it really is that simple.
We recommend you sign up for a free trial to see if it is right for you. If/when you're ready to send a real campaign, you simply buy more credits.
Sign in to your free trial account and purchase credits with any major credit card (Visa, MasterCard, Amex, and Discover). If you already know ESP is right for you, and you want to skip the free trial, you can create a new account here.