http://talk.trekweb.com/~jasonb/articles/exim_maildir_imap.shtml
======================	apt-get install courier-imap
maildirmake /home/user/Maildir
======================	testing
AB LOGIN "user" "password"
mail2:/etc/courier# telnet 127.0.0.1 imap
Trying 127.0.0.1...
Connected to 127.0.0.1.
Escape character is '^]'.
* OK Courier-IMAP ready. Copyright 1998-2002 Double Precision, Inc.  See COPYING for distribution information.
AB LOGIN user raffi
AB OK LOGIN Ok.
BC SELECT "Inbox"
* FLAGS (\Draft \Answered \Flagged \Deleted \Seen \Recent)
* OK [PERMANENTFLAGS (\Draft \Answered \Flagged \Deleted \Seen)] Limited
* 0 EXISTS
* 0 RECENT
* OK [UIDVALIDITY 1072498372] Ok
BC OK [READ-WRITE] Ok
ZZZZ LOGOUT
* BYE Courier-IMAP server shutting down
ZZZZ OK LOGOUT completed
Connection closed by foreign host.