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<?xml version="1.0"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">
<head>
  <meta name="MSSmartTagsPreventParsing" content="TRUE" />
  <!-- Copyright 2000-2011 Double Precision, Inc.  See COPYING for -->
  <!-- distribution information. -->

  <title>The Courier Mail Server</title>
  <link rel="icon" href="icon.gif" type="image/gif" />
</head>

<body>
  <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>&nbsp;<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>
</body>
</html>