Latest Release:
LiteMail PHP
Current stable release V1.01
Price: FREE for non commercial use, $9.95 for commercial/unlimited email addresses

LiteMail PHP is an easy to install bulk mailer and mailing list manager for small to medium size websites and businesses. LiteMail is a licensed product that is being distributed free for non commercial use. Without the need for any additional components, LiteMail can be installed in under 5 minutes on almost any *nix server with PHP and MySQL installed.

Features:
Free Release Limited to 250 Email Addresses
Commercial Release Unlimited Email Addresses
Bulk Mail Function
Easy Install
Bulk Import of Email Addresses
Bulk Export with Changable Delimiter
Batch Email Send to Ease Server Load
Secure Login
Opt Out Function

LiteMail PHP Menu
See Demo
Screenshot - Admin
Screenshot - Admin 2
Screenshot - Login
Screenshot - Sending
Screenshot - Form
Download Freeware
Buy Commercial
Support Forum
Installation Docs
License Agreement

In Development:
ProMail PHP
Currently in development - ERD 3/08
Estimated price: $24.95

ProMail is a feature rich bulk mailer. Combining features of many mailers on the market, ProMail is quite possibly the best bulk mailer on the web. With multiple admin capability, ProMail will be a great solution for companies that utilize the power of email to market their products and/or services. The ability to manage unlimited email groups, as well as unlimited campaigns will be the core of ProMail. Easy installation and a very intuative interface will set ProMail appart from its competition.

Planned Features:
All the Features of LiteMail
Multiple Admin Control
Unlimited Email Addresses
Unlimited Mailing Lists
Unlimited Newsletters (save newsletters)
HTML & Text Emails
Black List Support
Batch and Delay Control
Multiple SMTP Support
Web and CSV File Import
Web and CSV File Export
More to come

ProMail PHP Menu
Currently under development. See the forum link below to comment on upcoming features, or to make suggestions for the development.
Support Forum