Here is a nice tool you can use to help build your web business. It’s free and has been tested and found to be reliable.
it has limitations, but if you’re on a tight budget, this script from Mr. CgiGuy, might be just what you need:
SimpLISTic Mailing List Manager – v2.0
A simple to install and simple to use script that allows your visitors to add their email address automatically to your email list. You can then quickly send out emails to the entire list with one form. 2.0 has many new features including HTML emails, automatic signature, and address confirmation to avoid abuse.
Details and Download Link:
http://www.mrcgiguy.com/free_cgi_scripts.html