Our friends at Mailchimp run an excellent email marketing and communication service. They provide the functionality to build and manage email lists and design HTML email campaigns. Utilizing our recently introduced Server Post functionality, you can integrate your Formsite form with Mailchimp. This integration gives you the ability to build a form and have it automatically populate your Mailchimp mailing lists. You can then professionally send mass communications to the people who have filled out your form.
Say you are running a one-time event and require special registration information from each guest. You could build the registration form using Formsite, collect the registrations, and then use Mailchimp to communicate with your registrants before and after the event.