WordPress & Interspire Email Marketer Plugin

I have an instance of Interspire's Email marketer that I use to manage all my email marketing efforts. I need a WordPress plugin that will automatically subscribe new WordPress users to specific Interspire Email Marketer contact lists via an XML API. Documentation on Interspire XML API: [login to view URL] Required Elements: -Must be able to select Wordpress users based on role (IE: Administrator, Contributor, Author, Subscriber, etc) -Must be able to run multiple instances. Need to be able to have two different types of WordPress users being subscribed to different contact lists at the same time. -Must be able to pass user data to the contact list including: First Name, Last Name, eMail Address, Subscribe Date, etc. Ideally would like to able to match specific fields to custom fields within Interspire Email Marketer