297120 Newsletter Script Installation

I have a completed site that has a sign-up form imbedded into the pages. I need a Newsletter script to be implemented so the owner of the newsletter can send out newsletter emails. I need these features: Email signup from website pages Confirmation/Thankyou email sent to subscriber Unsubscribe link in every newsletter Subscription details in each newsletter Admin: Easy to operate interface - no complex procedures WYSIWYG interface for formatting newsletter to send out Subscribe/Unsubscribe function manually Thats about it. The site owner knows NOTHING about html so this must be so easy a child could operate it, but stilla low him to send html emails to his subscriber base. This is an URGENT project as I have only a few hours to get this implemented.