I need a Page where users can invite through email

Please start your bid with message "Email Invite" so that I know you are not a spam. I need a page exactly like this: [login to view URL] I need it to be a plugin that I can install in any wordpress installation. The plugin should give an option at the backend to insert an HMTL message to send including the message of the user. Please try this link [login to view URL] so you know the type of message it will send. A pretty simple plugin for a simple emailing feature. Thanks.