Sonic Mailer Pro (SMPro) from Sensation Designs is a nice PHP-based email newsletter system. Version 2.x offers rudimentary reader tracking*—basically it provides a count of how many times a mailing has been read. However, it provides no information about who read your message or when.
One of our clients needed better tracking than what SMPro provides. So, we wrote a simple program for them. You add a specially formatted <img> tag into your email message. When that image is loaded, a PHP script runs, updates a database table that stores the readership information, and then sends the image to the reader.
The program is somewhat rudimentary. It outputs the reader's name, email address, and date and time that they read the message. You can export the results to a CSV file for further processing with Excel or other such tools.
We are providing our readership tracking tool here for free with these provisions: the code is released as-is without any warranty, guarantee, or performance claim. You agree to use the tool at your own risk and hold Skypanther Studios and its employees harmless for all outcomes of using this tool. Furthermore, Skypanther Studios prohibits the use of this tool for monitoring spam or other such unsolicited email messages.
I agree and want to download it!
* Version 3 of Sonic Mailer will include reader tracking features when it's released in April or so of 2006.