The AMC Mail Client is a mail client striving to be a robust, fully gnome-compliant mail reader. However, the AMC Mail Client differs from other mail clients in that it attempts to utilize existing tools for mail retrieval, sending, and filtering, (fetchmail, sendmail/smtp, procmail). By not going through the process of reinventing the wheel, the AMC Mail Client starts out as a fully equipped client that inherits all of the features of these existing tools.
Evolution is the GNOME mailer, calendar, contact manager, and communications tool. Evolution represents the next step forward in GNOME applications. The tools which make up Evolution will be tightly integrated with one another and act as a seamless personal information-management tool.
GMailWatch is a GNOME Panel Applet that displays a summary of incoming mail (sender/subject) rather than just an icon. It's similar to the old xmailwatcher utility (and uses some of the same code), and is also based upon mailcheck (of gnome-core). The user can change the size of the panel applet.
mailq_applet is a GNOME 1 panel applet that shows the status of your outgoing mail queue. It's intended for dialup users who may connect, wait for the queue to drain, then disconnect. Having this on your panel is much more convenient than running mailq over and over again from a terminal. It works with Exim and Sendmail. If you use a different MTA, you may need to make some changes, but the code is so trivial that that shouldn't be difficult. This code is no longer used or maintained by its author.
SQmaiL is a mail reader for GNOME that stores all its mail in a MySQL database. This makes it blazingly fast for very large (10000 message) mail databases. It supports hierarchical vfolders based on SQL queries, so you can have your mail automatically categorized based on arbitrarily complex SQL expressions. It has excellent MIME support on both incoming and outgoing mail. Mail can be fetched from local spool files and POP servers. Full picons support and partial xface support is available, to give your mail that personal touch. The user interface is customizable with Glade, and the program itself is easily extensible with Python. Some command line utilities allowing access to the mail database without X are available.