If you are using cPanel and you want to add an automated email signup form to your web site that's so easy. You may use this script for free.
Top PHP scripts
1).
Attach files to your form mail using PHP Creating a PHP form to get the data from user plus a file upload field to attach a file to the email. This is include an advanced HTML auto responder and auto redirect.
2).
POPMail POPMail is a PHP script created for web based emails.This script is a POP3 client to send and check your mail.It is developed to send mails from a website.
3).
PHPformail PHPformail is an online PHP program capable of generating web based contact forms for your site to enable your site visitors to send their messages and feedbacks.
4).
Simple mail script Sends an email to you, the webmaster from a web page based form. Sends useful information in the actual message such as the senders IP.
5).
phpop phpop is a script for accessing web based emails. This script reads mails from POP server, sends new mails. It replies, forwards and deletes mails. It is simple and easy to use for web masters.
6).
OneFile OneFile is a script based on PHP for web based emails.This script is a package of several small applications which run in a browser.It is easy to customize.
7).
Phpmail 2 Phpmail web based email system with paypal, paypal recurring, clickbank, and 2checkout auto payment gateways to collect money from every email sign up.