Courier-IMAP (Copyright 1999-2002, Double Precision, Inc. GNU General Public License) is a standalone IMAP server that can be used with H-Sphere Qmail server to provide IMAP access to Maildirs.

To install Courier-IMAP:

1. Download IMAP installation:
   wget http://www.psoft.net/shiv/HS209/[OSCODE]/hsphere/hsphere-imap-1.5.3-1.[ext]
   where OSCODE is the code of the operating system, e.g.:
     RH72 for RedHat 7.2,
     MDK82 for Mandrake 8.2,
     FBSD4 for FreeBSD4.X (all FreeBSD4 updates)
   ext is the pakage extension:
     rpm for Linux,
     tgz for FreeBSD.
   
2. Install Courier-IMAP:
   Linux:
   rpm -ivh hsphere-imap-1.5.3-1.rpm
   FreeBSD:
   pkg_add hsphere-imap-1.5.3-1.tgz
   
3. Start Courier-IMAP:
   Linux:
   /sbin/chkconfig --level 2345 courier-imapd on
   /etc/rc.d/init.d/courier-imapd start
   FreeBSD:
   /usr/local/etc/rc.d/courier-imapd.sh start
   
4. For users of H-Sphere 2.1 and higher:
   If you like Courier-IMAP and would like to use it by default, open file /hsphere/shared/apache/htdocs/horde/imp/config/servers.php and change port 110 to port 143 and pop and pop3 to imap