                                  Courier-IMAP

   For a general introduction and configuration settings for some popular
   IMAP clients, go and read imap/README(.html).

   In this document:

     * Requirements
     * Upgrading
     * Installation
     * Account initialization hook
     * Using shared folders
     * CRAM-MD5 Authentication
     * Sending mail via an IMAP connection
     * Realtime folder status updates
     * Account OPTIONS
     * SMAP

Requirements

   Now is the good time to read the FAQ, before you start. The FAQ is located
   in the file imap/FAQ(.html?).

     * C++ compiler - A C++ compiler is required. The server is written in C,
       but there are some configuration scripts that use C++ code.
     * make - The GNU make is recommended. Solaris's make is to be avoided.
       xBSD already has a gmake port, install it and use it (use gmake
       everywhere this document refers to make).
     * GDBM/DB - either the GDBM or the Berkeley DB library is required.
     * FAM, the File Alteration Monitor (http://oss.sgi.com/projects/fam/) is
       optional. If FAM is installed, it is used for an enhanced IMAP IDLE
       implementation that provides real-time folder status updates to
       concurrent IMAP clients that have the same folder opened.
     * The Courier authentication library. Before installing Courier-IMAP,
       download and install http://www.courier-mta.org/authlib/.

UPGRADING

  Upgrading from Courier-IMAP 3, and earlier.

   Beginning with 4.0, the authentication library that used to be a part of
   Courier-IMAP's source has been spun off into a standalone authentication
   library.

   You must download and install the Courier Authentication Library from
   http://www.courier-mta.org/authlib/ before upgrading. Review the
   documentation in the courier-authlib package for more information.

   After upgrading to 4.0, or later, to avoid future confusion the old copies
   of these configuration files (including the .dist files), should be
   removed from Courier-IMAP's configuration directory. They now live in
   Courier-authlib's configuration directory (/usr/local/etc/authlib, or
   whatever was specified to Courier-authlib's configure script).

  Upgrading from Courier-IMAP 1.7.3, and earlier.

   After upgrading from Courier-IMAP 1.7.3, or earlier, any existing mail in
   POP3 mailboxes may show up as new mail, by some mail clients. Other mail
   clients may end up downloading a second copy of any message that was left
   in the mailbox before the upgrade. This is a one-time event. Courier-IMAP
   2.0.0 uses a different mechanism for generating POP3 message identifiers.
   Mail clients that use POP3 identifiers will behave as if all messages,
   that were left in the POP3 mailbox before the upgrade, were removed, and
   replaced by new messages that happen to be the same content. Depending on
   how the POP3 mail client works, it will either flag all messages in the
   mailbox as unread, or download a second copy of the message.

   Upgrading from Courier-IMAP 1.3.0, and later versions, is a
   straightforward process. Follow the instructions in the INSTALLATION
   section, below, to install the new version. The "make install-configure"
   command automatically preserves the existing system configuration.
   However, note that new versions of Courier-IMAP will often introduce
   additional configuration options. After make install-configure a cursory
   inspection of configuration files in /usr/lib/courier-imap/etc (the
   default location of the configuration directory) is recommended, in order
   to identify any new configuration settings that might need adjustment.

  Upgrading from Courier-IMAP 1.3.8.2 and earlier

   The default configuration options have slightly changed. The default
   configuration script will now always build the authdaemon module, and
   build all real authentication modules inside authdaemond. This is true
   even with the authvchkpw module.

  Upgrading from Courier-IMAP 1.2.3 and earlier

   Courier-IMAP 1.3.0 introduced a new configuration file format that allows
   configuration files to be automatically upgraded. Additionally, several
   existing configuration files have been renamed in order for their names to
   be consistent with the Courier build:

 Courier-IMAP < 1.3  Courier-IMAP 1.3.0
 --------            ---------
 imapd.config        imapd
 imapd-ssl.config    imapd-ssl
 pop3d.config        pop3d
 pop3d-ssl.config    pop3d-ssl

   The NEWS file has a detailed explanation of how configuration files are
   now installed. Basically, make install now installs configfilename.dist,
   and make install-configure copies configfilename.dist to configfilename,
   becoming the actual configuration file. If there is an existing
   configfilename, the old settings in configfilename which are still valid
   will be kept in the new configfilename.

   This only works as long as both the old and the new configuration files
   are in the new format, so this will actually take effect with your next
   upgrade Courier-IMAP. If the previous installed version of Courier-IMAP
   did not use the new format for configuration files (1.2.3 and earlier),
   the old configuration file is backed up to configfilename.bak.

   The recommended procedure for upgrading from versions 1.2.3 and earlier is
   as follows:

   The recommended upgrade procedure is as follows:

     * Back up /usr/lib/courier-imap/etc
     * Follow the installation procedures, below
     * After installing, manually edit all configuration files. Restore, by
       hand, any custom configuration settings.

   All configuration files are kept in the configuration directory. Nothing
   else in /usr/lib/courier-imap is configurable. Do not simply overwrite
   1.3.0 configuration files with configuration files from the previous
   version. It's tempting, but don't do it. It may work, but you will lose
   the automatic upgrade capability for future releases.

  Upgrading from Courier-IMAP 1.1 or earlier

   Note that Courier-IMAP 1.2 includes a compatible POP3 server, and the
   installation script will also install a POP3 server on your system. Even
   though it is installed, you are not required to use it, but you still need
   to be aware of its existence. If you install the RPM build of
   Courier-IMAP, you're going to get the POP3 server started at system boot.
   If you do not need POP3 services, edit both the pop3d.config and
   pop3d-ssl.config configuration files, and set POP3DSTART and POP3DSSLSTART
   to NO

  Upgrading from Courier-IMAP 1.0 or earlier

   If the server is running, manually stop the server before installing the
   new version.

INSTALLATION

   To compile and install the Courier-IMAP server (this is the short version,
   a longer version follows):

  
 $ ./configure [ options, see below ]
 $ make
 $ make check       # Note - the --enable-workarounds-for-imap-client-bugs
                    # option to configure will result in make check FAILING.
 $ su root
 # make install     # Or, make install-strip, to strip the executables.
 # make install-configure   # Install configuration files.

                    # Start the authdaemond process

     NOTE

     You MUST run the configure script as normal user, not root. Did you
     extract the tarball as root? It won't work. Remove the extracted source
     code. Log in as a normal user. Extract the source code as a normal user,
     then run configure. You will do everything as a normal user, except for
     the final step of installing the compiled software.

     NOTE

     Courier-IMAP does not use inetd or xinetd. Any inetd or xinetd
     configuration settings for the IMAP and POP3 ports must be turned off.
     Courier-IMAP will not start if inetd or xinetd is listening for IMAP or
     POP3 connections.

   --------------------------------------------------------------------------

   As mentioned in "Requirements", above, if you are using xBSD, you must use
   gmake instead of make.

   --------------------------------------------------------------------------

   NOTE: The configure script may run as much as 5-10 minutes on slow
   machines. It may appear that configure is stuck in a loop, but that's an
   illusion. Courier-IMAP is built from a collection of modular components,
   each with its own configuration script. The configuration scripts share a
   lot of common code, leading to an initial impression that the same
   configuration script is being repeatedly run.

   See below for a description of the options to the configure script.

   WARNING: set your umask to 022 before running make install or make
   install-strip.

   You should try make install-strip first. Use make install if make
   install-strip fails.

   The configure script accepts certain options, but the defaults should be
   fine most of the time. make install puts everything in
   /usr/lib/courier-imap. If the directory /etc/pam.d exists, make install
   creates /etc/pam.d/imap and /etc/pam.d/pop3, overwriting any existing
   files. If you have some other IMAP server installed, this means that you
   will want to save your existing configuration in /etc/pam.d/{imap|pop3}.

   "make check" performs some internal sanity checks. If make check fails,
   something is wrong, and Courier-IMAP may not work for you reliably.
   Certain options are documented to cause make check to fail, due to
   different IMAP protocol behavior. If you need to use those options, first
   compile Courier-IMAP without them, run make check, and if all goes well
   extract the source code again in a different directory, then build it for
   the second time using your options.

   After installation, you will need to review the files in
   /usr/lib/courier-imap/etc and make any changes you deem necessary.

   After running make install or make install-strip you will then have to
   modify your system's startup scripts to run Courier-IMAP when your system
   boots.

   Use the following command to start the Courier-IMAP server:

  
 $ /usr/lib/courier-imap/libexec/imapd.rc start

   This assumes that Courier-IMAP is installed in /usr/lib/courier-imap. Use
   the following command to stop Courier-IMAP:

  
 $ /usr/lib/courier-imap/libexec/imapd.rc stop

   You will have to add these commands to your system startup/shutdown
   scripts.

    IMAP over SSL

   To add SSL support you have to install OpenSSL before installing
   Courier-IMAP. Download OpenSSL from http://www.openssl.org/. Follow the
   instruction in OpenSSL package to install it and configure it. SSL support
   in Courier-IMAP has been tested with OpenSSL 0.9.5a.

   The /usr/lib/courier-imap/etc/imapd-ssl configuration file sets some
   additional options for SSL support, which you may need to adjust. Consult
   that configuration file for additional information. Then, you also have to
   run the /usr/lib/courier-imap/libexec/imapd-ssl.rc script from your system
   startup and shutdown scripts, just like the
   /usr/lib/courier-imap/libexec/imapd.rc script. You may accept both SSL and
   non-SSL connections by running both scripts.

   Note that SSL requires a valid, signed, X.509 certificate to be installed
   where Courier-IMAP expects to find it. The default location for the X.509
   certificate, in PEM format, is /usr/lib/courier-imap/share/imapd.pem. The
   X.509 certificate must be signed by a certificate authority that is known
   to the IMAP client. You can generate your own self-signed certificate by
   running the script /usr/lib/courier-imap/share/mkimapdcert which will work
   too, except that IMAP clients using SSL will display a warning message the
   first time they connect to the server. To get rid of the warning message
   you'll have to pay for a signed X.509 certificate. The gory details of
   setting up SSL is beyond the scope of this document, and you should
   consult the OpenSSL documentation for more information.

   The mkimapdcert script will not overwrite an existing imapd.pem
   certificate, in order to allow precompiled packages to simply call
   mkimapdcert after installation, without worry.

    The bundled POP3 server

   The POP3 server included with Courier-IMAP provides POP3 access to INBOX,
   and that's about it. Enabling the POP3 server is very similar to enabling
   the IMAP server, with the following differences:

   The configuration files are /usr/lib/courier-imap/etc/pop3dand
   /usr/lib/courier-imap/etc/pop3d-ssl.

   The startup/shutdown scripts are /usr/lib/courier-imap/libexec/pop3d.rcand
   /usr/lib/courier-imap/libexec/pop3d-ssl.rc.

   The SSL certificate is /usr/lib/courier-imap/share/pop3d.pem, and the
   /usr/lib/courier-imap/share/mkpop3dcert script can be used to create a
   self-signed SSL certificate for testing purposes.

    System-V style startup

   If your system uses System-V style startup scripts, take a look at
   courier-imap.sysvinit - this is a sample /etc/init.d script.
   courier-imap.sysvinit is created by configure. In most cases it can be
   merely copied to /etc/init.d and /etc/rc?.d directories (with the execute
   permission bit turned on).

   The sample startup script will check if IMAP or POP3 over SSL is enabled.
   The sample startup script automatically creates dummy SSL certificates the
   first time it is executed.

    Options to configure:

     * --prefix=pathname - install here, instead of /usr/lib/courier-imap
     * --without-ipv6 - do not compile IPv6 support. The configure
       automatically checks if IPv6 support is available, and enables it
       automatically. This option suppresses IPv6 support, even if it's
       available. IPv6 support means that Courier-IMAP will create an IPv6
       socket and accept IPv6 connections. --without-ipv6 should be used if
       your system does not fully support IPv6, or if its implementation is
       buggy. Most Linux distributions now ship with IPv6 support in glibc,
       but without compiling the kernel for IPv6 support. This results in
       modprobe regularly complaining in /var/log/messages about the fact
       that it can't load the IPv6 module. Use --without-ipv6 to turn off
       IPv6 support, if that bothers you.
     * --enable-unicode - include the ability to search and sort messages in
       character sets other than the default ISO-8859-1/US-ASCII. All
       character set tables supported by Courier-IMAP will be included. See
       below for more details.
     * --enable-unicode=charset,charset,... - include ability to search and
       sort messages, but only for these character sets. See below for more
       details.
     * --bindir=pathname , --mandir=pathname - override default names of
       subdirectories under prefix. See below for more information.
     * --with-db=db - Use the DB library instead of the GDBM library You must
       have either the GDBM or the DB library installed. If both are present,
       GDBM is selected unless you use this option. The GDBM/DB library is
       used by Courier for certain functions.
     * --with-piddir=dir - use dir/imapd.pid to store couriertcpd's process
       ID.
     * --with-userdb=file - use file instead of /etc/userdb (also means that
       userdb.dat and userdbshadow.dat are appropriately renamed).
     * --enable-workarounds-for-imap-client-bugs - there are a number of
       various bugs in certain IMAP clients. The current list of broken IMAP
       clients consists of Netscape Messenger and Sun's StarOffice. This
       option enables some workarounds for some bugs in these clients,
       however, note that this may break compatibility with software that
       correctly implements IMAP4rev1. Additionally, "make check" will fail
       when this option is used. See imap/BUGS.(html|txt) for more
       information. NOTE - if this option is used, make check WILL FAIL. You
       should first configure Courier-IMAP without this option, run make
       check, then reconfigure Courier-IMAP with this option.
     * --with-trashquota - include deleted messages, and the Trash folder, in
       the estimated quota usage for maildirs. Quotas are optional, see the
       file maildir/README.maildirquota.html for more information. The
       default configuration does not count messages marked as deleted (but
       not yet expunged) and the contents of the Trash folder (which are
       automatically purged by the server) against the quota usage. NOTE - if
       this option is used, make check WILL FAIL. You should first configure
       Courier-IMAP without this option, run make check, then reconfigure
       Courier-IMAP with this option.
     * --with-dirsync - after saving a new message to a maildir (the IMAP
       COPY and APPEND commands) explicitly sync the maildir's directory
       directory. There's a school of thought which believes that the Linux
       ext2 filesystem requires the parent directory to be synced, in
       addition to the new message file that's just been written to disk.
       There's another school of thought that thinks that this issue is
       completely blown out of proportion, and is really nothing more than a
       tempest in a teapot. However -- to accomodate the former school of
       thought -- this option adds a little bit of extra code to sync the
       parent directory.

    Foreign character set sorting/searching

   The Courier-IMAP server can search and sort messages using other than the
   default us-ascii/iso-8859-1 character set. You can find the list of
   available character sets in the file unicode/charsetlist.txt.

   The default is to include only the ISO-8859-1/US-ASCII character set. Use
   the --enable-unicode option to include all available character sets.

   It is also possible to include translation tables only for selected
   character sets. Example:

   --enable-unicode=iso-8859-1,utf-8,iso-8859-10

   Technically, IMAP servers must support the UTF-8 character set, however
   few IMAP clients (I've yet to see one, actually) care about UTF-8, so the
   UTF-8 character set is optional in Courier-IMAP. The only required
   character set - which is always included, explicitly or implicitly - is
   ISO-8859-1/US-ASCII.

   Note that character set translation tables need substantial memory. This
   should not be a problem in most cases. Most compilers will place the
   read-only character set tables into a shared text segment, that's shared
   by all running servers. --enable-unicode should not really be much of a
   burden for most modern operating systems.

   Attentive individuals will observe that all character set tables are
   compiled even without the --enable-unicode option. That is normal -- only
   the explicitly selected character set tables will actually make it into
   the final executable.

    Installation directories

   Unless the options --prefix, --bindir, or --mandir are used, everything
   will be installed in the directory /usr/lib/courier-imap.

   Use the --prefix option to specify a different directory. This directory
   will have the following subdirectories:

     * etc - configuration files
     * bin - binaries
     * sbin - superuser binaries
     * libexec - additional binaries
     * man - manual pages
     * share - scripts and data files
     * var - temporary files used by the authdaemond, daemon process (if the
       authdaemon authentication module is selected).

   Having everything installed underneath one directory allows its contents
   to be easily backed up, before a newer version of courier-imap is
   installed. Reverting to a previous version is as simple as restoring from
   backup.

   Because some binaries in bin and sbin may be executed from the command
   line, it will be necessary to change your systemwide global startup script
   to add this directory to the default PATH. Additionally, it will also be
   necessary to modify the configuration of the man(1) command so that it can
   find Courier-IMAP's manual pages in this directory:

         PATH="/usr/lib/courier-imap/bin:$PATH"
         if test -w /etc
         then
                 PATH="/usr/lib/courier-imap/sbin:$PATH"
         fi
         export PATH
         MANPATH="/usr/lib/courier-imap/man:$MANPATH"
         export MANPATH

   As an alternative, you may use the --bindir and --mandir options in order
   to install binaries to /usr/local/bin and the manual pages to
   /usr/local/man, which should already be searched by default:

         ./configure --bindir=/usr/local/bin --mandir=/usr/local/man

   Other familiar configure options, such as --sysconfdir and --datadir work
   too, for those who know how to properly use them.

ACCOUNT INITIALIZATION HOOK

   If there is a file or a symbolic link in the maildir called "loginexec",
   and if it is executable, then the executable file will be invoked after a
   succesful login. If the program terminates with an exit code of 0, the
   "loginexec" file (or a symbolic link) will be removed.

USING SHARED FOLDERS

   Courier-IMAP supports shared folders. See the file
   README.sharedfolders.html for information on how to set up shared folders.

CRAM-MD5 AUTHENTICATION

   CRAM-MD5 authentication allows IMAP clients to authenticate themselves
   without sending the password in clear-text over the network. Courier-IMAP
   now supports CRAM-MD5 by default, but is not enabled for reasons explained
   below. CRAM-MD5 support is implemented by the authcram module, with one
   exception - authldap, authpgsql, and authmysql support CRAM-MD5
   authentication if the LDAP or the MySQL/PostgreSQL server stores
   clear-text passwords, and not crypt-ed passwords.

   To use CRAM-MD5 it is necessary to use an IMAP client that support
   CRAM-MD5 authentication, of course. That's the easy part.

   The problem is that it is not possible to use the system password when
   logging in using CRAM-MD5. That's because CRAM-MD5 requires the knowledge
   of the actual password, in the clear, in order to calculate authentication
   tokens (even though that the password itself is not sent in the clear over
   the network).

   So, implementation of CRAM-MD5 is an advanced task that should be
   attempted only when you are comfortable with, and fully understand how
   Courier-IMAP works in general. Here's an overview of this procedure:

     * Install and implement /etc/userdb, because CRAM-MD5 authentication
       uses the /etc/userdb database (but see below for LDAP-specific notes).
     * Figure out which accounts are going to use CRAM-MD5 authentication.
       People who do not use an IMAP client that supports CRAM-MD5 can
       continue and log in with the existing system password. But everyone
       who runs a client that supports CRAM-MD5 authentication will need a
       new password. Also, it will be necessary to set up CRAM-MD5 passwords
       for everyone at the same time. As soon as CRAM-MD5 authentication is
       enabled, all CRAM-MD5 enabled clients will attempt to use it. If no
       password is available, Courier-IMAP has no choice but to reject the
       authentication attempt. Once that happens, the client will correctly
       interpret it as an authentication failure (and it is), and the client
       will not even try to authenticate using the system password. Use the
       following command to assign a CRAM-MD5 password:

 userdbpw -hmac-md5 | userdb userdb set hmac-md5pw


       Then run the makeuserdb command, as always.
     * NOTE: CRAM-MD5 authentication is also be supported by authldap,
       authpgsql and authmysql, as long as clear-text passwords are used. See
       below for more information. Therefore, if you use LDAP, PostgreSQL, or
       MySQL, and you store clear-text passwords, you should all set and
       ready to go, and you do not need to install /etc/userdb, as described
       in this section.

  Enabling CRAM-MD5 authentication

   Because of these unfortunate complexities, CRAM-MD5 authentication is
   disabled after installation. When you're ready to use CRAM-MD5, edit the
   imapd configuration file and add the "AUTH=CRAM-MD5" keyword to the
   IMAP_CAPABILITY environment variable, then restart Courier-IMAP. There are
   instructions in the imapd configuration file to that effect.

   If you do not intend to ever use CRAM-MD5 authentication, you can either
   specify --without-authcram option to the configure script, or simply edit
   imapd and remove authcram from the AUTHMODULES setting.

SENDING MAIL VIA AN IMAP CONNECTION

   This server allows using the IMAP connection to send E-mail. Normally, the
   IMAP protocol provides only access to mail in an existing mail account,
   and mail clients must use SMTP in order to send mail. The Courier-IMAP
   server has an optional setting to enable mail to be send via an IMAP
   connection in a manner that should work with all existing IMAP mail
   clients. This can be useful when an account is logged in from a shared
   access pool which normally blocks most access to the SMTP port.

   This is implemented by enabling a setting in the imapd configuration file
   that designates a folder as a special "Outbox" folder. The default setting
   is a folder called "Outbox" (IMAP path INBOX.Outbox), but the name can be
   changed to anything. This folder, for the most part, is no different than
   any other folder. If a folder by that name doesn't exist, it needs to be
   created, just like any other IMAP folder. It looks and acts like any other
   folder, except that each message added to the folder, via IMAP's APPEND or
   COPY command, will also be mailed out by the Courier-IMAP server to the
   addresses listed in the To:, Cc:, and Bcc: headers.

   It should be possible to use this to send mail from any IMAP client by:

    1. Composing a draft message, telling the IMAP client to save the draft
       message in its drafts folder on the IMAP server.
    2. Opening the drafts folder, and moving or copying the message to the
       Outbox folder.
    3. The act of copying the message into the Outbox folder will send the
       mail. There won't be any explicit notification to the fact that the
       message was sent, so it's a good idea to include your own E-mail
       address on the Cc: list.

     NOTE: it is tempting to configure the IMAP mail client to use Outbox as
     its default folder for saving drafts. Resist the temptation. If you
     forget, you'll save a partially completed draft, which will be then
     obediently mailed out.

     NOTE: the message, in addition to being sent, will be saved in the
     folder in the normal fashion. After saving the message, reopen the
     Outbox folder and delete the sent message, or move it someplace else.

     NOTE: when enabled, the Courier-IMAP server will advertize a private
     XCOURIEROUTBOX IMAP capability. It is theoretically possible to code an
     IMAP mail client that reads this capability and automatically configures
     itself accordingly -- when this IMAP capability is present -- to send
     E-mail in the normal way but using the IMAP connection. At this time,
     I'm not aware of any actual mail clients that know how to do this.

     NOTE: many mail clients save some additional internal information in
     headers of draft messages. The internal information is normally removed
     before the mail client sends the message. Make sure that none of this
     extra information is something that should not be mailed out.

REALTIME FOLDER STATUS UPDATES

   If the FAM, the File Alteration Monitor (http://oss.sgi.com/projects/fam/)
   is installed it will be possible to allow multiple clients to open the
   same folder, and have all clients to be simultaneously notified of any
   changes to the folder contents.

   After installing the server see the imapd(8) manual page for more
   information.

Account OPTIONS

   If the option 'disableimap' or 'disablepop3' is set to a non-zero value,
   then logins via IMAP or POP3 respectively will be disabled for that
   account. You can use the DEFAULTOPTIONS setting to disable a service
   globally and then re-enable it for individual accounts; for example,
   setting DEFAULTOPTIONS="disableimap=1" will disable IMAP access for all
   accounts except those which have option disableimap=0

   See README_authlib.html in the courier-authlib package for information on
   how to set per-account options.

SMAP

   Starting with Courier-IMAP 2.0, the server supports an experimental mail
   access protocol, dubbed "Simple Mail Access Protocol". SMAP is an
   experiment to provide enhanced mail processing beyond what's currently
   possible with IMAP. SMAP's purpose is to prototype and develop advanced
   mail access functionality that's not possible with IMAP. SMAP is disabled
   by default. Uncomment the SMAP_CAPABILITY setting in the imapd
   configuration file in order to enable SMAP. The Cone mail client supports
   SMAP.

References

   Visible links
   . file:///home/mrsam/src/courier-imap/INSTALL.html#requirements
   . file:///home/mrsam/src/courier-imap/INSTALL.html#upgrading
   . file:///home/mrsam/src/courier-imap/INSTALL.html#install
   . file:///home/mrsam/src/courier-imap/INSTALL.html#loginexec
   . file:///home/mrsam/src/courier-imap/INSTALL.html#shared
   . file:///home/mrsam/src/courier-imap/INSTALL.html#crammd5
   . file:///home/mrsam/src/courier-imap/INSTALL.html#imapsend
   . file:///home/mrsam/src/courier-imap/INSTALL.html#idle
   . file:///home/mrsam/src/courier-imap/INSTALL.html#options
   . file:///home/mrsam/src/courier-imap/INSTALL.html#smap
   . http://oss.sgi.com/projects/fam/
   . http://www.courier-mta.org/authlib/
   . http://www.courier-mta.org/authlib/
   . file:///home/mrsam/src/courier-imap/INSTALL.html#install
   . http://www.openssl.org/
   . file:///home/mrsam/src/courier-imap/README.sharedfolders.html
   . http://oss.sgi.com/projects/fam/
   . http://www.courier-mta.org/cone/index.html
