An Email Service Provider (ESP) is a company that offers you a way to send automated email messages Online. AWeber is our preferred ESP because of its ease of use and services. Here's a link for you to set up your account: http://www.ospautoresponder.com
Online Sales Pro integrates with five ESPs when we create swipes for our Online Sales Pro customers: AWeber, Active Campaign, GetResponse, MailChimp, and NowLifestyle.
This means that your OSP account connects the leads from your landing pages to your ESP's autoresponder, sending sales messages to the potential customers who sign up for more information about your product or service.