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 |  Exim (Linux) is a message transfer agent developed at the University of Cambridge for use on Unix systems connected to the Internet. There is a great deal of flexibility in the way mail can be routed, and there are extensive facilities for checking incoming mail. Exim can be installed in place of sendmail, although the configuration of exim is quite different to that of sendmail. | |  | |  Gaim (Linux, Windows, BSD, Mac) is a multi-protocol instant messaging client for Linux, BSD, MacOS X, and Windows. It is compatible with AIM (Oscar and TOC protocols), ICQ, MSN Messenger, Yahoo, IRC, Jabber, Gadu-Gadu, and Zephyr networks. | |  | |  Jabber (Linux, Windows, Mac, BSD, Solaris, Aix) is a set of streaming XML protocols and technologies that enable any two entities on the Internet to exchange messages, presence, and other structured information in close to real time. The first Jabber application is an instant messaging (IM) network that offers functionality similar to legacy IM services such as AIM, ICQ, MSN, and Yahoo. | | | |  Postfix (Linux, Mac, BSD, Solaris) is Wietse Venema's mailer that started life as an alternative to the widely-used Sendmail program. It attempts to be fast, easy to administer, and secure, while at the same time being sendmail compatible enough to not upset existing users. Thus, the outside has a sendmail-ish flavor, but the inside is completely different. | | | |  Qpopper (Linux) is the most widely-used server for the POP3 protocol (this allows users to access their mail using any POP3 client). Qpopper supports the latest standards, and includes a large number of optional features. Qpopper is normally used with standard UNIX mail transfer and delivery agents such as sendmail or smail. | | | |  Sendmail (Linux, BSD, Solaris, Aix) the first killer email application. For over twenty years, the most common program used to handle this was sendmail, written by Eric Allman. Over this time, sendmail has become a fully fledged language, with a very inelegant syntax. It is a SMTP transfer agent, which means it is responsible for transfering mail across networks and passes it off to a mail delivery agent, normally running POP3 or IMAP for delivery to users. | | | |  Thunderbird (Linux, Windows, Mac) is the e-mail and newsgroup client for 2004 and beyond. Thunderbird makes emailing safer, faster and easier than ever before with the industry's best implementations of features such as intelligent spam filters, a built-in spell checker, extension support, and much more. | | | |
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