Customization of GNU Mailman to create Groups using Ruby on Rails

We are looking to build interface for GNU Mailman using Ruby on Rails to create mailing list to discuss a popular technology or answer questions about a product or send a newsletter to customers. Here is the summary of the project: Customization of Mailman to create a Group using Ruby on Rails and functionality we want to have from RoR Application is: * Create a group and set basic permissions * Invite / Add / Remove members (User Management) * View and edit membership settings * Mail preferences or unsubscribe from a group * Email a group * Custom Email headers / set up SMTP headers. * Customize GNU Mailman list administration parameters. Functionality we are looking at is something like Google Groups, Constant Contact, Evite, Mail Chimp etc using Mailman or we are open to any technology which can be integrated with Ruby on Rails application to perform the above tasks