I have a static website on a LAMP. I already use a PHP script for the contact form. Now I need a small subscription box - PHP based - where people can leave / submit their email address so the client can send them e-letter or updates by email. I considered a free MailChimp account first, but it seems rather hard to make my own subscription box connected to a MailChimp account so I am considering a simple email submission form that is not to vulnerable spam wise. Any scripts out there or other solutions available for me?