Apéndice G. Archivo de configuración /etc/courier/imapd
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## Apéndice G. Archivo de configuración `/etc/courier/imapd`

    #
    #VERSION: $Id: courier-imapd.xml,v 1.1 2004/06/29 20:33:32 sergio Exp $
    #
    # imapd created from imapd.dist by sysconftool
    #
    # Do not alter lines that begin with ##, they are used when upgrading
    # this configuration.
    #
    #  Copyright 1998 - 2004 Double Precision, Inc.  See COPYING for
    #  distribution information.
    #
    #  This configuration file sets various options for the Courier-IMAP server
    #  when used with the couriertcpd server.
    #  A lot of the stuff here is documented in the manual page for couriertcpd.
    #
    #  NOTE - do not use \ to split long variable contents on multiple lines.
    #  This will break the default imapd.rc script, which parses this file.
    #
    ##NAME: ADDRESS:0
    #
    #  Address to listen on, can be set to a single IP address.
    #
    # ADDRESS=127.0.0.1

    ADDRESS=0

    ##NAME: PORT:1
    #
    #  Port numbers that connections are accepted on.  The default is 143,
    #  the standard IMAP port.
    #
    #  Multiple port numbers can be separated by commas.  When multiple port
    #  numbers are used it is possible to select a specific IP address for a
    #  given port as "ip.port".  For example, "127.0.0.1.900,192.68.0.1.900"
    #  accepts connections on port 900 on IP addresses 127.0.0.1 and 192.68.0.1
    #  The previous ADDRESS setting is a default for ports that do not have
    #  a specified IP address.

    PORT=143

    ##NAME: AUTHSERVICE:0
    #
    #  It's possible to authenticate using a different 'service' parameter
    #  depending on the connection's port.  This only works with authentication
    #  modules that use the 'service' parameter, such as PAM.  Example:
    #
    #  AUTHSERVICE143=imap
    #  AUTHSERVICE993=imaps

    ##NAME: MAXDAEMONS:0
    #
    #  Maximum number of IMAP servers started
    #

    MAXDAEMONS="40"

    ##NAME: MAXPERIP:0
    #
    #  Maximum number of connections to accept from the same IP address

    MAXPERIP="4"

    ##NAME: PIDFILE:0
    #
    #  File where couriertcpd will save its process ID
    #

    PIDFILE=/var/run/courier/imapd.pid

    ##NAME: TCPDOPTS:0
    #
    # Miscellaneous couriertcpd options that shouldn't be changed.
    #

    TCPDOPTS="-nodnslookup -noidentlookup"

    ##NAME: AUTHMODULES:0
    #
    # Authentication modules.  Here's the default list:
    #
    #    authdaemon
    #
    # The default is set during the initial configuration.
    #
    # If this is currently set to AUTHMODULES="authdaemon", DO NOT CHANGE IT.
    # Instead, change the parameter authmodulelist in authdaemonrc.

    AUTHMODULES="authdaemon"

    ##NAME: AUTHMODULES_ORIG:0
    #
    # For use by webadmin

    AUTHMODULES_ORIG="authdaemon"

    ##NAME: DEBUG_LOGIN:0
    #
    # Dump additional login diagnostics to syslog
    #
    # DEBUG_LOGIN=0   - turn off login debugging
    # DEBUG_LOGIN=1   - turn on login debugging
    # DEBUG_LOGIN=2   - turn on login debugging + log passwords too

    DEBUG_LOGIN=0

    ##NAME: IMAP_CAPABILITY:1
    #
    # IMAP_CAPABILITY specifies what most of the response should be to the
    # CAPABILITY command.
    #
    # If you have properly configured Courier to use CRAM-MD5 or CRAM-SHA1
    # authentication (see INSTALL), set IMAP_CAPABILITY as follows:
    #
    # IMAP_CAPABILITY="IMAP4rev1 UIDPLUS CHILDREN NAMESPACE THREAD=ORDEREDSUBJECT \
    #            THREAD=REFERENCES SORT QUOTA AUTH=CRAM-MD5 AUTH=CRAM-SHA1 IDLE"
    #

    IMAP_CAPABILITY="IMAP4rev1 UIDPLUS CHILDREN NAMESPACE THREAD=ORDEREDSUBJECT \
                     THREAD=REFERENCES SORT QUOTA IDLE"

    ##NAME: KEYWORDS_CAPABILITY:0
    #
    # IMAP_KEYWORDS=1 enables custom IMAP keywords.  Set this option to 0 to
    # disable custom keywords.

    IMAP_KEYWORDS=1

    ##NAME: SMAP1_CAPABILITY:0
    #
    # EXPERIMENTAL
    #
    # To enable the experimental "Simple Mail Access Protocol" extensions,
    # uncomment the following setting.
    #
    # SMAP_CAPABILITY=SMAP1

    ##NAME: IMAP_CAPABILITY_ORIG:1
    #
    # For use by webadmin

    IMAP_CAPABILITY_ORIG="IMAP4rev1 UIDPLUS CHILDREN \
                          NAMESPACE THREAD=ORDEREDSUBJECT \
                          THREAD=REFERENCES SORT QUOTA AUTH=CRAM-MD5 AUTH=CRAM-SHA1
    IDLE"

    ##NAME: IMAP_IDLE_TIMEOUT:0
    #
    # This setting controls how often
    # the server polls for changes to the folder, in IDLE mode (in seconds).

    IMAP_IDLE_TIMEOUT=60

    ##NAME: IMAP_CAPABILITY_TLS:0
    #
    # The following setting will advertise SASL PLAIN authentication after
    # STARTTLS is established.  If you want to allow SASL PLAIN authentication
    # with or without TLS then just comment this out, and add AUTH=PLAIN to
    # IMAP_CAPABILITY

    IMAP_CAPABILITY_TLS="$IMAP_CAPABILITY AUTH=PLAIN"

    ##NAME: IMAP_TLS_ORIG:0
    #
    # For use by webadmin

    IMAP_CAPABILITY_TLS_ORIG="$IMAP_CAPABILITY_ORIG AUTH=PLAIN"

    ##NAME: IMAP_DISABLETHREADSORT:0
    #
    # Set IMAP_DISABLETHREADSORT to disable the THREAD and SORT commands -
    # server side sorting and threading.
    #
    # Those capabilities will still be advertised, but the server will reject
    # them.  Set this option if you want to disable all the extra load from
    # server-side threading and sorting.  Not advertising those capabilities
    # will simply result in the clients reading the entire folder, and sorting
    # it on the client side.  That will still put some load on the server.
    # advertising these capabilities, but rejecting the commands, will stop this
    # silliness.
    #

    IMAP_DISABLETHREADSORT=0

    ##NAME: IMAP_CHECK_ALL_FOLDERS:0
    #
    # Set IMAP_CHECK_ALL_FOLDERS to 1 if you want the server to check for new
    # mail in every folder.  Not all IMAP clients use the IMAP's new mail
    # indicator, but some do.  Normally new mail is checked only in INBOX,
    # because it is a comparatively time consuming operation, and it would be
    # a complete waste of time unless mail filters are used to deliver
    # mail directly to folders.
    #
    # When IMAP clients are used which support new mail indication, and when
    # mail filters are used to sort incoming mail into folders, setting
    # IMAP_CHECK_ALL_FOLDERS to 1 will allow IMAP clients to announce new
    # mail in folders.  Note that this will result in slightly more load on the
    # server.
    #

    IMAP_CHECK_ALL_FOLDERS=0

    ##NAME: IMAP_OBSOLETE_CLIENT:0
    #
    # Set IMAP_OBSOLETE_CLIENT if your IMAP client expects \\NoInferiors to mean
    # what \\HasNoChildren really means.

    IMAP_OBSOLETE_CLIENT=0

    ##NAME: IMAP_ULIMITD:0
    #
    # IMAP_ULIMITD sets the maximum size of the data segment of the server
    # process.  The value of IMAP_ULIMITD is simply passed to the "ulimit -d"
    # command (or ulimit -v).  The argument to ulimi sets the upper limit on the
    # size of the data segment of the server process, in kilobytes.  The default
    # value of 65536 sets a very generous limit of 64 megabytes, which should
    # be more than plenty for anyone.
    #
    # This feature is used as an additional safety check that should stop
    # any potential denial-of-service attacks that exploit any kind of
    # a memory leak to exhaust all the available memory on the server.
    # It is theoretically possible that obscenely huge folders will also
    # result in the server running out of memory when doing server-side
    # sorting (by my calculations you have to have at least 100,000 messages
    # in a single folder, for that to happen).

    IMAP_ULIMITD=65536

    ##NAME: IMAP_USELOCKS:0
    #
    # Setting IMAP_USELOCKS to 1 will use dot-locking to support concurrent
    # multiple access to the same folder.  This incurs slight additional
    # overhead.  Concurrent multiple access will still work without this setting,
    # however occasionally a minor race condition may result in an IMAP client
    # downloading the same message twice, or a keyword update will fail.
    #
    # IMAP_USELOCKS=1 is strongly recommended when shared folders are used.

    IMAP_USELOCKS=1

    ##NAME: IMAP_SHAREDINDEXFILE:0
    #
    # The index of all accessible folders.  Do not change this setting unless
    # you know what you're doing.  See README.sharedfolders for additional
    # information.

    IMAP_SHAREDINDEXFILE=/etc/courier/shared/index

    ##NAME: IMAP_ENHANCEDIDLE:0
    #
    # If Courier was compiled with the File Alteration Monitor, setting
    # IMAP_ENHANCEDIDLE to 1 enables enhanced IDLE mode, where multiple
    # clients may open the same folder concurrently, and receive updates to
    # folder contents in realtime.  See the imapd(8) man page for additional
    # information.
    #
    # IMPORTANT: IMAP_USELOCKS *MUST* also be set to 1, and IDLE must be included
    # in the IMAP_CAPABILITY list.
    #

    IMAP_ENHANCEDIDLE=0

    ##NAME: IMAP_TRASHFOLDERNAME:0
    #
    # The name of the magic trash Folder.  For MSOE compatibility,
    # you can set IMAP_TRASHFOLDERNAME="Deleted Items".
    #
    # IMPORTANT:  If you change this, you must also change IMAP_EMPTYTRASH

    IMAP_TRASHFOLDERNAME=Trash

    ##NAME: IMAP_EMPTYTRASH:0
    #
    # The following setting is optional, and causes messages from the given
    # folder to be automatically deleted after the given number of days.
    # IMAP_EMPTYTRASH is a comma-separated list of folder:days.  The default
    # setting, below, purges 7 day old messages from the Trash folder.
    # Another useful setting would be:
    #
    # IMAP_EMPTYTRASH=Trash:7,Sent:30
    #
    # This would also delete messages from the Sent folder (presumably copies
    # of sent mail) after 30 days.  This is a global setting that is applied to
    # every mail account, and is probably useful in a controlled, corporate
    # environment.
    #
    # Important: the purging is controlled by CTIME, not MTIME (the file time
    # as shown by ls).  It is perfectly ordinary to see stuff in Trash that's
    # a year old.  That's the file modification time, MTIME, that's displayed.
    # This is generally when the message was originally delivered to this
    # mailbox.  Purging is controlled by a different timestamp, CTIME, which is
    # changed when the file is moved to the Trash folder (and at other times too).
    #
    # You might want to disable this setting in certain situations - it results
    # in a stat() of every file in each folder, at login and logout.
    #

    IMAP_EMPTYTRASH=Trash:7

    ##NAME: IMAP_MOVE_EXPUNGE_TO_TRASH:0
    #
    # Set IMAP_MOVE_EXPUNGE_TO_TRASH to move expunged messages to Trash.  This
    # effectively allows an undo of message deletion by fishing the deleted
    # mail from trash.  Trash can be manually expunged as usually, and mail
    # will get automatically expunged from Trash according to IMAP_EMPTYTRASH.
    #
    # NOTE: shared folders are still expunged as usual.  Shared folders are
    # not affected.
    #

    IMAP_MOVE_EXPUNGE_TO_TRASH=0

    ##NAME: OUTBOX:0
    #
    # The next set of options deal with the "Outbox" enhancement.
    # Uncomment the following setting to create a special folder, named
    # INBOX.Outbox
    #
    # OUTBOX=.Outbox

    ##NAME: SENDMAIL:0
    #
    # If OUTBOX is defined, mail can be sent via the IMAP connection by copying
    # a message to the INBOX.Outbox folder.  For all practical matters,
    # INBOX.Outbox looks and behaves just like any other IMAP folder.  If this
    # folder doesn't exist it must be created by the IMAP mail client, just
    # like any other IMAP folder.  The kicker: any message copied or moved to
    # this folder is will be E-mailed by the Courier-IMAP server, by running
    # the SENDMAIL program.  Therefore, messages copied or moved to this
    # folder must be well-formed RFC-2822 messages, with the recipient list
    # specified in the To:, Cc:, and Bcc: headers.  Courier-IMAP relies on
    # SENDMAIL to read the recipient list from these headers (and delete the Bcc:
    # header) by running the command "$SENDMAIL -oi -t -f $SENDER", with the
    # message piped on standard input.  $SENDER will be the return address
    # of the message, which is set by the authentication module.
    #
    # DO NOT MODIFY SENDMAIL, below, unless you know what you're doing.
    #

    SENDMAIL=/usr/sbin/sendmail

    ##NAME: HEADERFROM:0
    #
    # For administrative and oversight purposes, the return address, $SENDER
    # will also be saved in the X-IMAP-Sender mail header.  This header gets
    # added to the sent E-mail (but it doesn't get saved in the copy of the
    # message that's saved in the folder)
    #
    # WARNING - By enabling OUTBOX above, *every* IMAP mail client will receive
    # the magic OUTBOX treatment.  Therefore advance LARTing is in order for
    # _all_ of your lusers, until every one of them is aware of this.  Otherwise if
    # OUTBOX is left at its default setting - a folder name that might be used
    # accidentally - some people may be in for a rude surprise.  You can redefine
    # the name of the magic folder by changing OUTBOX, above.  You should do that
    # and pick a less-obvious name.  Perhaps brand it with your organizational
    # name ( OUTBOX=.WidgetsAndSonsOutbox )

    HEADERFROM=X-IMAP-Sender

    ##NAME: IMAPDSTART:0
    #
    # IMAPDSTART is not used directly.  Rather, this is a convenient flag to
    # be read by your system startup script in /etc/rc.d, like this:
    #
    #  . /etc/courier/imapd
    #
    #  case x$IMAPDSTART in
    #  x[yY]*)
    #        /usr/lib/courier/imapd.rc start
    #        ;;
    #  esac
    #
    # The default setting is going to be NO, so you'll have to manually flip
    # it to yes.

    IMAPDSTART="YES"

    ##NAME: MAILDIRPATH:0
    #
    # MAILDIRPATH - directory name of the maildir directory.
    #
    MAILDIRPATH=Maildir

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