eCRM is not an ordinary mailing list manager or an ordinary mailto CGI; it is a small Web-based customer relationship management system. It contains many usefull functions for business needs. With eCRM you can manage your customers online and transfer them in to your normal applications. Key features include address management, ability to group customer records, statistics about your customers, automatic form creation that can be implemented on several Web sites (mailto that stores the contact in the database), and more.
Microbrew Message Center is designed to be an immensely scalable mail platform supporting multiple users, multiple domains, and multiple mail servers. It is akin to iPlanet or post.office but is not as complex and uses open source software to perform mundane services such as Web and mail services.
Mailer is a program for managing email aliases in Unix. It allows users and administrators to easily create and manage email aliases. Mailer relieves administrators of the task from having to manually create aliases, and provides users with a powerful mechanism for setting up simple email lists and for redirecting their email without the use of .forward files.
Ezmlm mailing list manager class is a PHP class to create and manage mailing lists with ezmlm. It features display of a table that shows lists already created, listing of local and domain parts as well as the number of current subscribers, creation and alteration of list properties, alteration of list automatic message texts, and support for list virtual hosts. It comes with a SOAP server interface to handle remote requests to subscribe and unsubscribe users, count subscribers, and verify if an address is already subscribed.