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+The Courier IMAP server is a fast, scalable, enterprise IMAP server
+that uses Maildirs. Many E-mail service providers use the Courier IMAP
+server to easy handle hundreds of thousands of mail accounts. With its
+built-in IMAP and POP3 aggregation proxy, the Courier IMAP server has
+practically infinite horizontal scalability. In a proxy configuration,
+a pool of Courier servers service initial IMAP and POP3 connections
+from clients. They wait to receive the client's log in request, look
+up the server that actually holds this mail account's mailbox, and
+establish a proxy connection to the server, all in a single, seamless
+process. Mail accounts can be moved between different servers, to
+achieve optimum resource usage.