Custom Autoresponder

I have a website where the first name and email are collected. I want each first name and email to be added to an autoresponder installed on my server. I will need the thank you page on the autoresponder to be my custom thank you page. Now, the autoreponder will also create a special link in each message. This link will have encrypted in it, the email address of the person the autoresponder email was sent to. That way, if the order button is clicked (on the webpage the link in the email directs to) that persons email is automatically removed from the autoresponder database.