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Postfix is Wietse Venema's mailer that started life as an alternative to the widely-used Sendmail program. Postfix 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.
NGINX [Engine-X] is an HTTP(S) server, HTTP(S) reverse proxy and IMAP/POP3 proxy server written by Igor Sysoev. It has been running on many heavily loaded sites, including Facebook, Zappos, Groupon, LivingSocial, Hulu, TechCrunch, Dropbox, Tumblr and WordPress.
Mutt is a small but very powerful text-based mail client for Unix operating systems. Though written from scratch, Mutt's initial interface was based largely on the ELM mail client. To a large extent, Mutt is still very ELM-like in presentation of information in menus (and in fact, ELM users ... [More]
Evolution provides integrated mail, addressbook and calendaring functionality to users of the GNOME desktop.
Dovecot is an open source IMAP and POP3 server for Linux/UNIX-like systems, written with security primarily in mind.
KDE PIM is sub project of KDE. Its goal is to provide an application suite to manage personal information. This includes mail, time, people and more. The main result is KDE Kontact, our personal information manager.
The KDE Kontact Personal Information Management suite unites mature and proven KDE applications under one roof. Thanks to the powerful KParts technology, existing applications are seamlessly integrated into one. The components of KDE Kontact are tailored to work well with each other. This results ... [More]
Exim is a message transfer agent (MTA) developed for Unix systems connected to the Internet. It is similar to Smail 3, but expands on Smail features.
Fetchmail is a full-featured, robust, well-documented remote-mail retrieval and forwarding utility intended to be used over on-demand or permanent dynamic-address TCP/IP links (such as SLIP or PPP connections). It supports every remote-mail protocol now in use on the Internet: POP3, IMAP4r1, ETRN ... [More]
Sendmail is a remarkably flexible program, supporting many kinds of mail transfer and delivery including the overwhelmingly popular SMTP.