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<!-- Copyright 2000-2011 Double Precision, Inc. See COPYING for -->
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<title>The Courier Mail Server</title>
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<h1><a target="_blank" href=
"http://sourceforge.net/projects/courier/" shape=
"rect"><em>Courier</em> Mail Server</a></h1>
<p><a target="_blank" href="http://www.courier-mta.info" shape=
"rect"><img src="japanese_flag.png" alt="www.courier-mta.info"
border="0" width="60" height="40" /></a> <a target="_blank"
href="http://www.intron.ac/cn/freesoft/courier.php" shape=
"rect"><img src="chinese_flag.png" alt="www.intron.ac" border="0"
width="60" height="40" /></a></p>
<p><font size="2"><em>Copyright 1998-2012 Double Precision, Inc.
This software is distributed under the terms of the GNU General
Public License. See COPYING for additional
information.</em></font></p>
<p>The <em>Courier</em> mail transfer agent (MTA) is an
integrated mail/groupware server based on open commodity
protocols, such as ESMTP, IMAP, POP3, LDAP, SSL, and HTTP.
<em>Courier</em> provides ESMTP, IMAP, POP3, webmail, and mailing
list services within a single, consistent, framework. Individual
components can be enabled or disabled at will. The
<em>Courier</em> mail server now implements basic web-based
calendaring and scheduling services integrated in the webmail
module. Advanced groupware calendaring services will follow
soon.</p>
<p>The <em>Courier</em> mail server's source code should compile
on most POSIX-based operating systems based on Linux, and
BSD-derived kernels. The <em>Courier</em> mail server should also
compile on Solaris and AIX, with some help from Sun's or IBM's
freeware add-on tools for their respective operating systems.</p>
<p>The <em>Courier</em> mail server evolved out of several
related projects, that merged together (more on that later). The
<em>Courier</em> mail server implements SMTP extensions for
mailing list management and spam filtering. The <em>Courier</em>
mail server can function as an intermediate mail relay, relaying
mail between an internal LAN and the Internet, or perform final
delivery to mailboxes. The <em>Courier</em> mail server uses
<a target="_blank" href=
"http://www.courier-mta.org/mbox-vs-maildir/" shape=
"rect">maildirs</a> as its native mail storage format, but it can
also deliver mail to legacy mailbox files as well. The
<em>Courier</em> mail server's configuration is set by plain text
files and Perl scripts. Most of The <em>Courier</em> mail
server's configuration can now be adjusted from a web browser,
using The <em>Courier</em> mail server's web-based administration
module.</p>
<p>The <em>Courier</em> mail server can provide mail services for
regular operating system accounts. The <em>Courier</em> mail
server can also provide mail services for virtual mail accounts,
managed by an LDAP, MySQL, or PostgreSQL-based authentication
database.</p>
<p>Certain portions of the <em>Courier</em> mail server -
<a target="_top" href="http://www.courier-mta.org/maildrop/"
shape="rect">the mail filtering engine</a>, the <a href=
"http://www.courier-mta.org/sqwebmail/" target="_top" shape=
"rect">webmail server</a> and the <a target="_top" href=
"http://www.courier-mta.org/imap/" shape="rect">IMAP server</a> -
are also available as separate, smaller, packages that can be
used with other mail servers.</p>
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