XFMail is an X11 application for receiving electronic mail. It implements most of its email functionality internally so that it does not depend on a lot of extra packages. It supports POP3, MBOX, IMAP4, sendmail, and SMTP. It has built-in support for interfacing with PGP, GPG, ispell/aspell, faces, LDAP, and esound. It runs on most Unix variants.
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.