Postfix is an attempt to provide an alternative to the widely-used Sendmail program. Postfix attempts to be fast, easy to administer, and hopefully secure, while at the same time being sendmail compatible enough to not upset your users.
Brutus is an Exchange connector and development framework that offers access to all of MAPI and therefore to all versions of Microsoft Exchange from version 5.5 onwards. It is a complete wrapping of all of MAPI into a (large) set of CORBA interfaces. It enables any client application to integrate seamlessly into any organization with existing Exchange deployments on an equal footing with MS Outlook. Being based on CORBA, it is platform independent, and works equally well on Linux, the BSDs, Windows, or wherever there is a CORBA implementation available.
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Exim is a message transfer agent (MTA) developed at the University of Cambridge for use on Unix systems connected to the Internet. In style it is similar to Smail 3, but its facilities are much more extensive. Exim is in use at many sites around the world.
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Kolab is a groupware system that provides a comprehensive and flexible solution for workgroups. Email, contacts, and group calendars can be managed via the Web, Windows/Outlook, and Linux/KDE. It supports offline synchronization and full seamless support of mixed client environments because the Kolab-XML storage format is fully open and avoids MAPI/TNEF.
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The Courier mail transfer agent (MTA) is an integrated mail/groupware server based on open commodity protocols such as ESMTP, IMAP, POP3, LDAP, SSL, and HTTP. Courier provides ESMTP, IMAP, POP3, Webmail, and mailing list services within a single consistent framework. Individual components can be enabled or disabled at will. Courier implements basic Web-based calendaring and scheduling services integrated in the Webmail module.
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getmail is intended as a simple, secure, and reliable replacement for fetchmail. It retrieves email (either all messages, or only unread messages) from one or more POP3, SPDS, or IMAP4 servers (with or without SSL) for one or more email accounts, and reliably delivers into qmail-style Maildirs, mboxrd files, or through external MDAs (command deliveries) specified on a per-account basis. getmail also has excellent support for domain (multidrop) mailboxes, including delivering messages to different users or destinations based on the envelope recipient address.
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Citadel is an advanced messaging and collaboration system for groupware and BBS applications. Users can connect to Citadel using any telnet, WWW, or client software. Among the features supported are public and private message bases (rooms), electronic mail, real-time chat, paging, shared calendaring, address books, mailing lists, and more. Unlike other collaboration servers, Citadel provides its own data stores and is therefore extremely easy to install; you don't have to "bring your own" email and database because they're built in. The server is multithreaded and scalable. In addition, SMTP, IMAP, and POP3 servers are built-in for easy connection to Internet mail. Citadel is both robust and mature; it has been in production since 1987.
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XMail is an Internet and intranet mail server featuring an ESMTP server, POP3 server, finger server, TLS support for SMTP and POP3 (both server and client side), multiple domains, no need for users to have a real system account, SMTP relay checking, DNS based maps check, custom (IP based and address based) spam protection, SMTP authentication (PLAIN LOGIN CRAM-MD5 POP3-before-SMTP and custom), a POP3 account synchronizer with external POP3 accounts, account aliases, domain aliases, custom mail processing, direct mail files delivery, custom mail filters, mailing lists, remote administration, custom mail exchangers, logging, and multi-platform code.
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Animail is a multiserver POP3/APOP/IMAP4 (with or
without SSL) mail retrieval utility. It features
an advanced filtering system based on
blacklisting, whitelisting, or a combination of
both. It is possible to send an autoresponse which
prompts people to reply and add themselves to the
'autoaccept' file. It also allows filters based on
regular expressions which match against the email
headers. (If a message is filtered, only the
header is downloaded, not the entire body.)
Combining external filtering programs (e.g.
SpamAssassin or Bogofilter) as message
post-download plugins is also easily acomplished,
thus extending filtering capabilities in an
unlimited way. Available delivery options include
mailbox, maildir, local SMTP, and pipe to a command.
IndiMail is a messaging platform built using qmail and other messaging software. IndiMail has the ability to distribute the users in a domain across multiple hosts. IndiMail has multiple queues (called a queue collection), which can achiever very high concurrencies. The system IDs and configuration files used by IndiMail are all configurable through a set of environment variables, allowing you to customize IndiMail the way you want. IndiMail does not use hard-coded uid/gid in the executables, which makes it easy to distribute a binary package. IndiMail has features that any modern email server should have: SMTP, QMQP, QMTP, IMAP, POP3, DKIM, BATV, greylisting, filtering capability, and spam/virus control.
vpopmail (vchkpw) is a collection of programs and a library to
automate the creation and maintenance of virtual domain email
configurations for qmail installations using either a single UID/GID
or any valid UID/GID in /etc/passwd with a home directory. Features
are provided in the library for other applications which need to
maintain virtual domain email accounts. It supports named or IP-based
domains. It works with vqadmin, qmailadmin, vqregister, sqwebmail, and
courier-imap. It supports MySQL, Sybase, Oracle, LDAP, and file-based
(DJB constant database) authentication. It supports SMTP
authentication combined with the qmail-smtp-auth patch. It supports
user quotas and roaming users (SMTP relay after POP authentication).
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NullLogic Groupware is a modular Web-based groupware and email system designed for contact management and event scheduling. Additional features include private messaging, public discussion forums, webmail, shared bookmarks, file sharing, call tracking, order processing, an XML-RPC API, and integrated POP3 and SMTP servers.
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Maillog View is a Webmin module that allows you to easily view all your /var/log/maillog.* files. It features autorefresh, message size indication, ascending/descending view order, compressed file support, and a full statistics page. Sendmail, Postfix, Exim, and Qmail (partially) are supported. Courier MTA support is experimental.
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Clement is an email server application. Its main function is to block unwanted mail (spam) as soon as possible in the email exchange process. It accepts or rejects email while the SMTP session, initiated by the email sender, is still pending, accepting legitimate email messages without the need to return an error status to non-existent or "borrowed" return address later. Clement can operate in two modes, either as a standard MTA (as sendmail, Postfix, Exim, Exchange, etc.) to store email in the recipient's own area, or to transmit the mail to an another SMTP server acting as smart spam filtering device. Each email domain name Clement knows about can be treated in one of these two modes depending on the group to which the domain name has been set. Each message is verified by a virus scanner (ClamAV) while the SMTP connection is still open, but the refusal of mail and the reason for refusal is notified to the actual sender. Mail management is done via a Web interface and can be delegated to three administrative levels (Root-Admin, Group-Admin, Domain-Admin). Standard users can access their own logs (sent email status, email rejected, quarantined email, etc.). With this interface, the user can handle the rejection and acceptance of mail. Users who are level "Admin" can access the session logs (via the Web interface). Clement uses a SQL database (PostgreSQL, MySQL) to store and manage logs, user profiles, and dynamic management of directives concerning the sender-receiver relationship.
Yahoo Mail Sucker allows you to fetch Yahoo Mail messages to your local inbox (after the free POP3 service has been suspended).