Autoresponder - Follow up System

In need of a professional full featured Autoresponder System. Here are some of the features needed but not limited to: -User friendly Control Panel -Ability to create and schedule unlimited autoresponders/mailing -Ability to personalize every follow-up message -Ability to ad a double opt in to every follow-up messages. -Ability to send unlimited emails at once -Ability to Import email lists in several formats (e.g. comma delimited, with full name, email address, country, etc. fields) -Ability to export email list in the same formats as in importing -Ability to check and purge duplicate emails -Ability to add attachments on every folow-up message -Ability to create subscripton box HTML code with preview -Ability to add as many fields as desired to subscription box -Ability to send messages either in Text or HTML format -Ability to track source of subscribers to analyze marketing campaigns -Ability to copy messages from one autoresponder to another one -Ability to test follow-up message by sending to your own email -Ability to broadcast messages, to send to one subscriber, several or all. -Ability to create/edit newsletters with an easy wysiwyg editor -Ability to allow subscribers to unsubscribe from a link or from a unsubscribe box -Ability to choose SMTP or SendMail from server to broadcast messages -Ability to have pre-defined email templates for members to use -Built in Affiliate system to promote the follow-up system -Tracking system to keep track of advertising campaigns -Integration with Paypal and 2Checkout -Ability to create different levels of memberships -Ability to sell the follow-up system as a stand alone system for user to install on their own server