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Claws Mail (previously known as Sylpheed-Claws) project is an e-mail client (and news reader), based on GTK+.

The appearance and interface are similar to some popular e-mail clients for Windows, such as Outlook Express, Becky!, and Datula. The interface is also designed to emulate the mailers on Emacsen, and almost all commands are accessible with the keyboard.

The messages are managed in MH format, and you’ll be able to use it together with another mailer based on MH format (like Mew). You can also utilize fetchmail and/or procmail, and external programs on receiving (like inc or imget).

Claws Mail is distributed under the GPL.

Here are some key features of “Claws Mail”:

· Multiple accounts
· Threaded display
· Filtering
· Mime attachments
· Usenet news reading and posting
· SSL over POP3, SMTP, IMAP4rev1 and NNTP protocols
· GnuPG support (with GPGME)
· Build-in image viewer
· X-Face support
· User-defined headers
· Colour labels
· Multiple MH folder support
· Mbox import/export
· External editor
· Message queueing and drafting
· Automated mail checking
· Templates
· Line-wrapping
· Clickable URIs
· XML-based addressbook
· Printing
· Plugin mechanism
· Reply-finder
· New message cache system
· New sort function
· New filtering/processing mechanism
· Spell checking (with aspell)
· Powerful Extended Search
· MH/IMAP/MBOX folder drag ‘n’ drop support
· POP before SMTP authentication
· Automatic saving of message when composing
· Automatic message drafting and cache saving on kill
· Built-in GDB crash handler
· Customisable toolbars
· Quick search function
· ‘Dynamic’ signatures
· Font configuration
· Icon theming Automatic account selection
· Message scoring
· Ability to hide read messages
· IMAP over SSH Tunnel
· IMAP: UIDPLUS extension support.
· IMAP: CAPABILITY support.
· Request Return-Receipt
· Extra Folder properties:
· Return-receipt
· Save messages
· Default To:
· Subject simplification
· Folder CHMOD
· Default account
· Folder colour
· Revised compose window
· ‘Ignore thread’ option
· Improved clickable URL support
· URI parser accepts mailto URLs with a ‘?’
· Configurable notification of new mail
· 7bit and 8bit encoding of attachments
· NNTP: auto-mark cross-posted messages
· Configurable (non-)display of images
· Signature in the message view can be coloured
· User-definable quotation characters
· Indication of unread answers to marked mails: ‘(!)’ is appended to the folder name when a marked message has a response
· Display url in statusbar on single-click
· online/offline modes
· –online and –offline command-line switches
· Message priority setting
· Controllable size of log text in log window
· Ability to select part of a text mime-part to reply
· Reply and forward flags get set on sending message
· Sylpheed man page
· GnuPG users are informed of expired signatures and keys
· GnuPG signed messages are indicated by an icon in the Attachment column
· ‘On-the-fly’ changing of the type of GnuPG encryption and/or signing used (MIME/ascii) in the Compose window
· Manual selection of MIME type and encoding for attachments
· Allow user to ‘Save all’ attachments in a mail with multiple attachments
· Save 2 or more selected files to a single file
· Cc and Bcc Template definitions
· SSL certificate management
· Logging can be stopped
· User-definable newsgroup names abbreviation length
· Manual and FAQ remote and local links
· Actions: trailing “>” syntax to insert command’s output without replacing old text (in contrast to trailing “|”)
· Address book: import Mutt addressbook
· Address book: import Pine addressbook
· Address book copy and paste
· Support for LDAP dynamic queries
· Harvest addresses for addressbook
· Export addressbook to html file
· Address book: ‘Edit Group Details’ dialog allows multiple selection in either pane
· .mh_sequences file is created in new MH folders

Visit Claws Mail Team to download latest version.

Qpopper project 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.

Qpopper’s goals are: security, stability, safety, features, and performance.

The 3 and later code base has multiple levels of protection again common security vulnerabilities, so even if there is a bug at one level, the other levels can protect against an exploit. Stability means running without crashing or other problems. All bug reports are reviewed and taken seriously.

Safety means protecting the user’s mail. Qpopper takes extra precautions to guard against spool corruption, even if there is a system crash or power failure during an update. Qpopper provides a large number of features, such as bulletins, support for wireless devices, APOP, integration with packages such as Kerberos, drac, etc.

Qpopper strives for the maximum possible performance consistent with safety. You can also tell Qpopper when it is running in an environment where some precautions are not required, resulting in extra performance (for example, if users do not access mail using shell accounts).

This server is fully compliant with RFC 1939 (which defines the POP protocol) and RFC 2449 (which defines the POP extension mechanism and the extended response codes), and works with all known POP3 clients.

Qpopper also supports Kerberos V4 and V5 if enabled.

Here are some key features of “Qpopper”:

· Faster start-up (1,000 times faster, in many cases)
· Reduced I/O at session end (one-third less!)
· TLS/SSL (allows authentication and email to be strongly encrypted between any TLS/SSL-enabled mail client and Qpopper 4.0.5; requires TLS/SSL)
· Plus all the great features of Qpopper 3.1 (including full sources)
· Most compile-time options now are available at run-time
· Easier administration

Visit QUALCOMM Incorporated to download latest version.

Exim is a message transfer agent (MTA) developed at the University of Cambridge for use on Unix systems connected to the Internet.

Exim is freely available under the terms of the GNU General Public Licence. In style it is similar to Smail 3, but its facilities are more general.

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.

Visit exim.org to download latest version.

Sylpheed is a GTK+ based, lightweight, and fast email client. Almost all commands are accessible with the keyboard.

Sylpheed also has many features such as multiple accounts, POP3/APOP support, thread display, and multipart MIME.

One of Sylpheed’s future goals is to be fully internationalized. The messages are managed in the MH format, so you’ll be able to use it together with another mailer that uses the MH format.

Visit sylpheed.good-day.net to download latest version.

Mozilla Thunderbird is a full-featured email, RSS and newsgroup client that makes emailing safer, faster and easier than ever before.

It offers some advantages over other mail clients, including junk mail classification. Built from Mozilla code, Mozilla Thunderbird uses Gecko, the most standards-compliant rendering engine in existence.

In addition to the feature set found in Mozilla Mail, Thunderbird has several new features and improvements to make your mail and new experience better.

Here are some key features of “Mozilla Thunderbird”:

· Adaptive Junk Mail Controls
· RSS Integration
· Saved Search Folders
- Saved Search Folders display messages based on previously set search criteria. For example, instead of filtering messages into a new folder, you can create a Saved Search Folder that lists all the messages received from a certain person over the past 30 days, even if those messages are stored in different folders and subfolders.
· Global Inbox Support
- POP3 users can now combine all of their POP3 accounts into a single global inbox under local folders.
· Message Grouping
- You can now group messages in a folder by attributes such as date, sender, priority or a custom label. For instance, a folder grouped by date will group messages from today, yesterday, last week, etc. into self-contained groups in the message list pane. (View > Sort By > Grouped By Sort)
· Privacy Protection
- In order to help protect your privacy, Thunderbird now automatically blocks remote image requests in emails from senders you don’t know.
· Comprehensive Mail Migration from other Mail Clients
- Switching to Thunderbird has never been easier since Thunderbird can now migrate all of your email data including settings, mail folders and address book data from common mail applications such as the Mozilla 1.x Suite, Outlook Express, Outlook and Eudora.

Visit Mozilla Corporation to download latest version.

Postfix project 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.

Visit postfix.org to download latest version.

MailScanner is an email virus scanner, vulnerability protector, and spam tagger. It supports the Postfix, Sendmail, Exim, Qmail, and ZMailer MTAs, and the Sophos, McAfee, F-Prot, F-Secure, CommandAV, InoculateIT, Inoculan, eTrust, Kaspersky, Nod32, AntiVir, BitDefender, RAV, Panda, DrWeb, ClamAV, and other anti-virus scanners.

MailScanner uses SpamAssassin for highly successful spam identification, and is designed to handle denial of service attacks. It will detect password-protected zip files and apply filename checking to their contents.

It is very easy to install, requires no changes at all to your sendmail.cf file, is designed to be lightweight, and won’t grind your mail system to a halt with its load. It can be integrated into any email system, regardless of the software in use.

Visit mailscanner.info to download latest version.

Mail Notification is a status icon (aka tray icon) that informs you if you have new mail.

Mail Notification works with system trays implementing the freedesktop.org System Tray Specification, such as the GNOME Panel Notification Area, the Xfce Notification Area and the KDE System Tray.

Here are some key features of “Mail Notification”:

· multiple mailbox support
· mbox, MH, Maildir, Sylpheed, POP3, IMAP and Gmail support
· SASL authentication support
· APOP authentication support
· SSL/TLS support
· automatic detection of mailbox format
· immediate notification (the status icon is updated within seconds after a mailbox changes)
· a mail summary
· HIG 2.0 compliance.

Visit mailnotify to download latest version.

SpamAssassin project is a mature, widely-deployed open source project that serves as a mail filter to identify spam, also known as unsolicited commercial email (UCE)

SpamAssassin uses a variety of mechanisms including header and text analysis, Bayesian filtering, DNS blocklists, and collaborative filtering databases. SpamAssassin runs on a server, and filters spam before it reaches your mailbox.

Here are some key features of “SpamAssassin”:

· Wide-spectrum: SpamAssassin uses a wide variety of local and network tests to identify spam signatures. This makes it harder for spammers to identify one aspect which they can craft their messages to work around.
· Free software: it is distributed under the same terms and conditions as other popular open-source software packages such as the Apache web server.
· Easy to extend: Anti-spam tests and configuration are stored in plain text, making it easy to configure and add new rules.
· Flexible: SpamAssassin encapsulates its logic in a well-designed, abstract API so it can be integrated anywhere in the email stream. The Mail::SpamAssassin classes can be used on a wide variety of email systems including procmail, sendmail, Postfix, qmail, and many others.
· Easy Configuration: SpamAssassin requires very little configuration; you do not need to continually update it with details of your mail accounts, mailing list memberships, etc. Once classified, site and user-specific policies can then be applied against spam. Policies can be applied on both mail servers and later using the user’s own mail user-agent application.

Visit SpamAssassin Team to download latest version.

Evolution provides integrated mail, addressbook and calendaring functionality to users of the GNOME desktop.

Here are some key features of “Evolution”:

· No viruses or worms
· Junk filtering
· Desktop integration
· Developer Platform (EDS)
· Evolution#
· EPlugin
· Advanced email searching
· Web calendars
· vFolders
· User-defined filters
· Multiple accounts
· Palm device support
· Customized reminders
· Multiple calendar views
· iCalendar support
· To-Do list
· LDAP compatible
· Share vCards
· Security and encryption
· Open Source

Visit Novell Inc. to download latest version.