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prayer.cf.5.gz

PRAYER.CF(5)             File Formats Manual            PRAYER.CF(5)

NAME
     prayer.cf — main Prayer configuration file

DESCRIPTION
     prayer.cf is the configuration file of prayer(8) and
     prayer-session(8).

SYNTAX
     For the most part, prayer.cf consists of option = value pairs,
     but some configuration items are more complex. All values may
     be enclosed in double quotes, which are stripped. Quotes must
     be used if a value contains a ‘#’ character. Otherwise, every‐
     thing following it is treated as a comment.  Any line can be
     folded using a ‘\’ character at the end of the line; any linear
     white space at the beginning of the next line is removed.

     Simple options can be of the following types:

     string    No particular restrictions.

     path      A file or directory name. The configuration parser
               expands occurences of a few macros in settings of
               this type. See prefix and var_prefix below.

     boolean   The following forms are interpreted as true: ‘true’,
               ‘t’, and ‘1’.  The following forms are interpreted as
               false: ‘false’, ‘nil’, ‘0’.  Capitalisation does not
               matter.

     number    An integer number (sequence of digits 0-9), option‐
               ally immediately followed by a single letter ‘K’,
               causing the number to be multiplied by 1024, or ‘M’
               multiplying it by 1024 · 1024.

     time      An integer number (sequence of digits 0-9) of sec‐
               onds, optionally immediately followed by a single
               case-insignificant letter ‘s’, which has no effect,
               ‘m’, causing the number to be multiplied by 60, ‘h’,
               multiplying it by 60 · 60, or ‘d’, for a multiple of
               24 · 60 · 60.

     perm      A file permission mode; an octal number of exactly
               four digits, where the first digit must be 0.

OPTIONS
     prefix (string), var_prefix (string)
             The values of these options can be referred to as
             $prefix (or ${prefix}), and $var_prefix (or
             ${var_prefix}), respectively, in settings of type path
             in the rest of the file.

             Default: none. Need to be set only if referenced later.

     prayer_user (string), prayer_uid (number)
             User name or ID to setuid(2) to if started as root.
             Either, but not both, must be set and must not specify
             uid 0.  Default: none.

     prayer_group (string), prayer_gid (number)
             Group name or ID to setgid(2) to if we start off as
             root. In addition, prayer calls initgroups(3) if
             prayer_user is set.  Default: none.

     prayer_background (boolean)
             Run prayer as background process. If true, prayer will
             return as soon as valid configuration is found.
             Default: true

     file_perms (perm)
             Create mode for new files.  Default: 0640 if prayer_uid
             or prayer_user is set, otherwise 0644.

     directory_perms (perm)
             Create mode for new directories.  Default: 0750 if
             prayer_uid or prayer_user is set, otherwise 0755.

     check_directory_perms (boolean)
             Check existing directories under ${var_prefix}?

   Mail server settings
     imapd_server (string)
             Specifies the default IMAP server(s) using libc-client
             syntax:

                   host[:port][/flag[/flag]...]

             Multiple server specifications can be listed, separated
             by commas. Common flags are:
             /ssl              Use SSL-on-connect (on port 993 by
                               default).
             /tls              Force use of TLS (using STARTTLS on
                               the normal IMAP port) to encrypt the
                               session. Recommended if the server is
                               remote, since otherwise a downgrade
                               attack is possible.
             /notls            Don't issue STARTTLS even if the
                               server supports it. Recommended if
                               the server is localhost.
             /novalidate-cert  Don't check the integrity of the
                               server certificate.
             For the full list of flags, see naming.txt.gz in the
             current libc-client package.

     imapd_user_map (path)
             CDB lookup map overriding default imapd_server loca‐
             tion. For information on CDB, see
             ·   http://cr.yp.to/cdb.html
             ·   http://en.wikipedia.org/wiki/Constant_Data_Base

     prefs_folder_name (string)
             Name of Prayer user preferences folder on IMAP server.

     use_namespace (boolean)
             Use IMAP NAMESPACE command to find personal_hierarchy
             and hiersep.  Default: true.

     personal_hierarchy (string)
             If not supplied by NAMESPACE.  Default: "".

     hiersep (string)
             If not supplied by NAMESPACE.  Default: "/".

     dualuse (boolean)
             Hint to Prayer that new mailboxes are dual use (i.e.
             can contain both mail and inferior mailboxes). Things
             will mostly work if dualuse set to false on a server
             which supports it, but people will be unable to create
             children of newly created mailboxes without refreshing
             the view.

             Default: false.

     sieved_server (string)
             Talk to Cyrus timsieved using MANAGESIEVE protocol.
             Syntax is similar to imapd_server, except the only
             recognised flag is /ssl.

     sieved_user_map (path)
             Can be used to provide individualised imapd_server set‐
             tings in the form of a CDB file.

     sieved_timeout (time)
             Default timsieved timeout is 10 minutes

   Mail domain configuration
     local_domain
             Define a valid local domain, and optionally the valid
             local parts in that domain.  This is a special direc‐
             tive that can appear multiple times and does not use an
             equals sign:

             local_domain domain [map]

             Without map, local_domain simply defines a domain which
             will appear on the list visible to user preferences.
             With map, it also defines a list a CDB map file which
             defines valid entries in that domain; used for personal
             name expansion and checking for valid addresses: The
             keys are the valid local parts and the values are the
             corresponding full names of the users.

             Default: A single entry which corresponds to
             default_domain.

     return_path_domain (string)
             Domain used in the return address given to sendmail(8).
             Default: the default domain.

     filter_domain_pattern (string)
             A filter pattern which is equivalent to, or at least
             approximates the list of local domains.  Default: the
             default domain.

     hostname (string)
             Hostname is the canonical name for this particular sys‐
             tem, used in session and icon URLs which are generated
             by Prayer. This is derived automatically using
             gethostname(2) and gethostbyname(3) if no value is pro‐
             vided. However, there are situations, especially
             involving SSL certificates, where the default hostname
             may not be appropriate. The special value
             ‘__UNDEFINED__’ here means the startup script or com‐
             mand line must provide a hostname using a
             --config-option override or via the environment vari‐
             able PRAYER_HOSTNAME.  This is just a safeguard for
             systems which use DNS round robining to distribute load
             across a number of machines.

     hostname_service (string)
             Host name common for all Prayer installations part of
             the same webmail service. (Only) useful for large
             installations using DNS round robin for load balancing
             (example: webmail.hermes.cam.ac.uk is an alias for web‐
             mail[123].hermes.cam.ac.uk). This setting is used for
             two things: The user is redirected to this hostname
             after logging out, and HTTP requests are sanity checked
             against it in addition to the canonical hostname.

             Default: none

     fix_from_address (boolean)
             suppresses the From address option from the Preferences
             and Roles screens.  Default: false.

     lookup_rpasswd (path)
             Path to a CDB file that maps arbitrary search keys to
             colon- or comma-separated lists of user names.  Note:
             Keys must be lowercase; Prayer converts search strings
             to lowercase in order to provide case-insensitive
             lookup.

     lookup_rusername (path)
             Path to a second CDB file that maps arbitrary search
             keys to colon- or comma-separated lists of user names.

             If the user enters a valid and existing username
             according to getpwnam(3), Prayer does not search these
             first two CDB files, but skips directly to the second
             stage of looking up user information.

     lookup_username (path)
             Path to a CDB file that maps usernames to records con‐
             sisting of the user's “registered name” and his/her
             affiliation (department), separated by a vertical bar
             (‘|’).  Additionally, if a second vertical bar follows,
             the account is regarded as cancelled.

             When presenting the search results, the usernames found
             are combined with the default_domain to form email
             addresses. It is not possible at this time to let users
             search for addresses in more than one domain using this
             facility.

     lookup_fullname (path)
             Path to a CDB file that maps usernames to “display
             names”, possibly provided by the users themselves in
             some way. The display name of a user is used together
             with the email address in recipient fields

             Note that all four lookup options must be set to valid
             CDB files for the local lookup to work, but more than
             one option may conceivably point to the same file.

     ldap_server (string)
             Name or address of LDAP server.

     ldap_base_dn (string)
             Base DN to search. After binding anonymously, Prayer
             performs a one-level-scope search for entries with
             surname or mail attributes containing the search
             string. The following attributes are fetched and pre‐
             sented:
             ·   uid
             ·   displayName
             ·   cn (“registered name”)
             ·   ou (“affiliation”)
             ·   mail
             ·   telephoneNumber

     ldap_timeout (time)
             Search timeout.  Default: 30s.

   HTTP and other frontend settings
     use_http_port, use_https_port
             Define a single HTTP[S] port to bind to.  You can
             define an arbitary list of ports of both kinds by using
             a series of separate use_http_port and use_https_port
             directives, with one port on each line. Syntax:

                   use_http_port [interface:]port
                   use_https_port [interface:]port

             interface can be an IP (v4 or v6) address or a host‐
             name. If provided, it is passed to getaddrinfo(3) for
             resolution, and the first resulting address is used to
             bind to. Otherwise, prayer(8) binds to port on all
             interfaces.

     ssl_default_port (number)
             Prayer will put a warning on the login page for HTTP
             connections if both HTTP and HTTPS sessions are avail‐
             able. This will provide a link to the SSL version of
             the service, defaulting to port 443 or failing that the
             first defined HTTPS port. ssl_default_port overrides
             the built in logic.

             Should be rarely required now that Prayer automatically
             derives an appropriate port if none is provided here.

     ssl_cert_file (path)
             Locatation of SSL certificate file (only used if SSL
             ports defined).  Required if we are going to provide
             SSL services.

     ssl_privatekey_file (path)
             Location of SSL private key file (only used if SSL
             ports defined).  Required if we are going to provide
             SSL services.

     ssl_rsakey_lifespan (time)
             Master server will regenerate shared RSA key at this
             interval.  Default: 15m.

     ssl_rsakey_freshen (time)
             RSA key remains fresh in child process for this long
             after first actual use.  Default: 15m.

     ssl_session_timeout (time)
             SSL session cache TTL.  Default: 0 (SSL session cache
             not used). prayer-ssl-prune(8) should be run
             periodically to purge any stale session data from the
             DBD database.

     egd_socket (path)
             Path to entropy gathering daemon socket. If provided,
             it will be used in place of or in addition to
             /dev/urandom

     contact_email (string)
             System administrator email address.  This setting is
             currently not used. If you want to display support
             information to your users, customise the templates.

     fatal_dump_core (boolean)
             Dump core on fatal() error.  Default: false.

     log_debug (boolean)
             Enable somewhat more verbose logging, mainly in rela‐
             tion to SSL.  Default: false.

     fix_client_ipaddr (boolean)
             Client must connect from consistent IP addresses. May
             be useful as a security measure in LAN environments.
             Painful for dialup users whose connections may drop
             out.  Default: false.

     gzip_allow_nets (string), gzip_deny_nets (string)
             prayer-session(8) gzip-compresses pages sent to clients
             if:
             1.   gzip compression enabled at compile time,
             2.   use_gzip is set in user preferences,
             3.   User agent is known to support Content-Encoding:
                  gzip,
             4.   User agent asks for Content-Encoding: gzip or x-
                  gzip,
             5.   IP address of client appears in gzip_allow_nets or
                  IP address of client does not appear in
                  gzip_deny_nets.

             The format of these options is a sequence of
             ipaddr[/masklen] items, separated by colons and
             whitespace (to allow for IPv6 addresses to be parsed
             easily). If masklen is omitted, the item is interpreted
             as a full host address.

     log_name_nets (string)
             A network list in the same format as gzip_allow_nets
             above. To avoid delay when a user logs in,
             prayer-session(8) only performs a reverse lookup of the
             remote address if matches this list.  Default: empty;
             no reverse lookup are performed.

     limit_vm (number)
             Virtual memory limit imposed on each process to stop
             runaway process killing system. See setrlimit(2).
             Default: no limit.

     http_max_method_size (number)
             Prayer should in theory be able to cope with input of
             arbitrary size. In practice however, the incoming
             request has to be stored somewhere and without limits
             an attacker may exhaust available memory, causing a
             denial of service attack.

             This sets the maximum size of the initial line of an
             HTTP request.  Default: no limit.

     http_max_hdr_size (number)
             Maximum for headers associated with this request.

     http_max_body_size (number)
             Maximum for HTTP payload. This is the most significant
             one in normal use.

     draft_att_single_max (number)
             Maximum size of a single attachment when composing a
             mail.  Default: 0 (unlimited).

     draft_att_total_max (number)
             Maximum size of all attachments.  Default: 0
             (unlimited).

     http_min_servers (number)
             Minimum number of preforked prayer(8) HTTP servers. The
             master process forks new slave processes whenever the
             number of idle slaves falls below this number, unless
             the total number of slaves would exceed
             http_max_servers.  Default: 4.

     http_max_servers (number)
             Maximum number of preforked prayer(8) HTTP servers
             (active and idle). The master process does not, how‐
             ever, enforce any maximum number of idle slave
             processes; they have to terminate voluntarily by timing
             out or serving the maximum number of connections.
             Default: 64.

     http_max_connections (number)
             Maximum number of connections that each frontend server
             will process.  Default: 0 (no limit).

     http_timeout_idle (time)
             Timeout for (dirty) spare server waiting for another
             HTTP connection.  Default: 30s.

     http_timeout_icons (time)
             Timeout for HTTP connection that last served static
             content.  Default: 10s.

     http_timeout_session (time)
             Timeout for HTTP connection that last served a session
             URL or has not served anything yet.  Default: 60s.

     http_cookie_use_port (boolean)
             Present HTTP cookies to browser as
             “username:port=value” rather than “username=value”.
             Allows simultaneous login sessions from a single client
             browser.  However can leave a trail of cookies behind.
             Probably don't want this in the long term, it's here
             for experimentation purposes only at the moment.

     icon_expire_timeout (time)
             The amount of time in the future to set the HTTP
             Expires: field for static content. Default: 7d.  (In
             contrast sessions URLs expire immediately: Browsers
             really shouldn't be trying to cache this stuff, espe‐
             cially when it is coming in over HTTPS).

   Session specific configuration
     session_idle_time (time)
             Session switches to idle mode after this much time:
             connections to IMAP and accountd servers are shut down.
             Default: 0 (idle mode disabled).

     session_timeout (time)
             Session terminates after this much idle time.  ‘0’
             means session never times out.  Default: 4h.

     session_timeout_compose (time)
             Session terminates after this much idle time instead
             when the last command was ‘compose’ or ‘sieve’.  It
             should probably not be set lower than session_timeout.
             Default: 0 (always use the same timeout).

     stream_ping_interval (time)
             Ping INBOX, Other, and Draft streams at this interval.
             Default: 5m.

     stream_checkpoint (boolean)
             Use CHECKPOINT instead of PING to “ping” streams.
             Default: true.

     stream_misc_timeout (time)
             Shut down Postponed, Preferences and Transfer streams
             entirely after this much idle time, but only if idle
             mode doesn't beat us to it.  Default: 0 (disabled).

     log_ping_interval (time)
             stat(2) log files at this interval to see if target
             file has been renamed or removed.  ‘0s’ means stat()
             log file every time something is logged.  Default: 5m.

     db_ping_interval (time)
             Interval at which to re-read CDB files containing the
             local domain.  Default: 30m.

     recips_max_msg (number)
             Maximum number of recipients per message.  Default: 0
             (unlimited).

     recips_max_session (number)
             Maximum number of recipients per session. Automatically
             creates file in sending_block_dir if limit reached and
             that is defined.  Default: 0 (unlimited).

     sending_allow_dir (path)
             Create empty file named user in this directory to dis‐
             able recips_max_session for that user.

     sending_block_dir (path)
             Create empty file named user in this directory to dis‐
             able outgoing email for that user (automatic defense
             against phishing attacks).

   Display specific configuration
     login_banner (string)
             Used in the <title> and heading of the login page
             Default: "Webmail Service Login".

     login_service_name (string)
             Used in the <title> and elsewhere to refer to the
             webmail system after the user has logged in. Default:
             "Prayer".

     login_template (string)
             Template to use on the login screen.

     login_insert1_path (path)
             Optional file to include in login page template (as
             $login_insert1).

     login_insert2_path (path)
             Optional file to include in login page template (as
             $login_insert2).

     motd_path (path)
             File to use as the part of the login page immediately
             following the login form.

     ssl_encouraged (boolean)
             If the user connects over unencrypted HTTP, do not show
             the login form on the start (/) page. A link to /login,
             where the form is still displayed, is still provided.
             Default: false. Ignored if ssl_redirect or ssl_required
             is true.

     ssl_redirect (boolean)
             If the user connects over unencrypted HTTP, return a
             ‘302’ redirect to the default SSL port. Only the start
             (/) page is redirected and it may be possible to switch
             between http and https after loggin in, subject to
             cookie rules.

             Default: false.

     ssl_required (boolean)
             Return a ‘403 Forbidden’ error if the user tries to
             access anything over unencrypted HTTP.  ssl_redirect
             still has effect, however.

     list_addr_maxlen (number)
             The maximum number of characters to show from addresses
             on the mailbox list screen.  Default: 30.

     list_subject_maxlen (number)
             The maximum number of characters to show from the sub‐
             ject on the mailbox list screen.  Default: 30.

     change_max_folders (number)
             The maximum number of folders allowed in the quick
             folder change dropdown list. If there would be too many
             folders, the quick list is disabled altogether. Only
             folders that are expanded in the folder view are
             included.

             Default: 20.

     template_path (path)
             Path to uncompiled template sets (directories).
             Default: "../templates" (relative to tmp_dir).

     template_set (string)
             Template set to use.  Default: "xhtml_strict".

     template_use_compiled (boolean)
             Use the compiled-in templates, ignoring template_path.
             Default: true.

     theme   Define themes and their colors.  Semi-deprecated;
             Colours set with this directive are only used by the
             xhtml_transitional template set. The xhtml_strict
             template set, as well as the login screen, use CSS
             instead. It is still necessary to tell Prayer which
             themes are available, however.

             Syntax:

                   theme name description description
                   theme name element colour
                   theme name element colour
                   ...

             description is the label shown in the theme dropdown
             lists on the General Preferences page.

             element is one of fgcolor, fgcolor_link, bgcolor,
             bgcolor_banner, bgcolor_row1, bgcolor_row2,
             bgcolor_status, bgcolor_status_none, fgcolor_quote1,
             fgcolor_quote2, fgcolor_quote3, and fgcolor_quote4.
             The first three are not used by any standard template
             set, but are available.  Please study the templates to
             understand how the rest are used.

             colour is any valid HTML %Color value. Remember that
             strings containing hash marks need to be quoted.

     theme_default_main (string)
             The name of the default theme.

     theme_default_main (string)
             The name of the default theme in help mode.

     use_ispell_language
             Ispell languages that we want to support, with some
             descriptive text for the preferences screen. Syntax:

                   use_ispell_language wordlist description

             Example:

                   use_ispell_language british "British English"

   Paths etc.
     aspell_path (path)
             Location of Aspell Binary (takes precedence over
             ispell_path).

     bin_dir (path)
             Location of Prayer binaries (prayer(8) and
             prayer-session(8)).  Default: none. Must be set.

     icon_dir (path)
             Location of icon files.  Default: none. Must be set.

     ispell_path (path)
             Location of Ispell Binary (backwards compatibility
             only).

     log_dir (path)
             Location of log files.  Default: none. Must be set.

     pid_dir (path)
             Location for PID files of prayer and prayer-session
             master processes.  Default: none. Must be set.

     sendmail_path (path)
             Location of sendmail binary or drop in replacement such
             as Exim.  Default: /usr/lib/sendmail.

     socket_dir (path)
             Location for unix domain sockets which connect
             (prayer(8) to prayer-session(8)).

     socket_split_dir (boolean)
             Split socket directory into 64 subdirs keyed on first
             letter of sessionID. It is possible to switch back and
             forth without moving sockets or killing sessions, since
             prayer(8) tries both variants. In effect, this setting
             merely controls where prayer-session(8) creates the
             socket files. Default: false.

     init_socket_name (string)
             Name of Unix domain socket (in socket_dir) used for
             initial handshake between prayer and prayer-session
             processes when a user logs in.  Default: none. Must be
             set.

     ssl_session_dir (path)
             Location of the SSL session cache database.  Default:
             none. Must be set, even if the SSL session cache is
             disabled.

     static_dir (path)
             Location of other static files (CSS).  Default: none.
             If unset, Prayer will not serve CSS files.

     tmp_dir (path)
             As the directory both daemons chdir(2) to at startup,
             it is where temporary files, such as attachments and
             folders in transist during upload and download opera‐
             tions, are written. Core files also end up here.
             Default: none. Must be set.

   Defaults for user preferences
     confirm_logout (boolean)
             Confirmation dialogue when user logs out.  Default:
             true.

     confirm_expunge (boolean)
             Confirmation dialogue when user hits expunge.  Default:
             false.

     confirm_rm (boolean)
             Confirmation dialogue when user deletes mail folder or
             directory.  Default: true.

     default_domain (string)
             Default domain for outgoing mail. Defaults to hostname
             setting.

     expunge_on_exit (boolean)
             Expunge deleted messages from inbox automatically on
             logout.  Default: false.

     html_inline (boolean)
             Show text/html bodyparts inline. Content is scrubbed to
             remove dangerous tags. text/html will be displayed in
             preference to text/plain if this is set Default: true.

     html_remote_images (boolean)
             Show remote images automatically. If this is not set,
             "Show unsafe images" links will appear on pages showing
             HTML mail.  Default: false.

     html_inline_auto (boolean)
             Same as above for text/* bodyparts which start "<HTML>"
             (case-independent!)  Does anyone other than spammers
             actually use this?  Default: true.

     ispell_language (string)
             Language for ispell.  Default: "british".

     msgs_per_page (number)
             Number of messages per screen on message list screen.
             Default: 12.

     msgs_per_page_max (number)
             Maximum value that users are allowed to set
             msgs_per_page to. Default: 50.

     msgs_per_page_min (number)
             Minimum value that users are allowed to set
             msgs_per_page to. Default: 4.

     abook_per_page (number)
             Number of addressbook entries per page on address book
             list screen.  Default: 12.

     abook_per_page_max (number)
             Maximum value that users are allowed to set
             abook_per_page to. Default: 50.

     abook_per_page_min (number)
             Minimum value that users are allowed to set
             abook_per_page to. Default: 4.

     maildir (string)
             Mail directory in user's account.  Default: "".  Typi‐
             cally needed with uw-imap. Typically not needed with
             e.g. Dovecot or Courier.

     suppress_dotfiles (boolean)
             Supress dotfiles from directory listing.  Default:
             true.

     postponed_folder (string)
             Name of the folder where messages to be sent later,
             a.k.a. drafts, are stored.  Default: "postponed-msgs".

     sent_mail_folder (string)
             Name of folder for sent mail.  Default: "sent-mail".

     small_cols (number)
             Width of small compose textarea in columns.  Default:
             80.

     small_rows (number)
             Height of small compose textarea in lines.  Default:
             18.

     large_cols (number)
             Width of large compose textarea in columns.  Default:
             80.

     large_rows (number)
             Height of large compose textarea in lines.  Default:
             32.

     sort_mode (string)
             Default Sort mode for mailbox list. One of ARRIVAL,
             DATE, FROM, TO, CC, SIZE, SUBJECT, REFERENCES,
             ORDEREDSUBJECT.  Default: ARRIVAL is most efficient,
             and recommended.

     sort_reverse (boolean)
             Favour reverse sort rather than normal sort order?
             Default: false.

     abook_sort_mode (string)
             Default Sort mode for addressbook list. One of:
             ORDERED, ALIAS, NAME, COMMENT, ADDRESS.  Default:
             ORDERED.

     abook_sort_reverse (boolean)
             Favour reverse sort rather than normal sort order?
             Default: false.

     line_wrap_len (number)
             Wrap lines at this many characters.  Default: 76.

     line_wrap_advanced (boolean)
             Enable advanced line wrap options?  Default: false.

     line_wrap_on_reply (boolean)
             Line wrap automatically on reply.  Default: true.

     line_wrap_on_spell (boolean)
             Line wrap automatically on spell check.  Default: true.

     line_wrap_on_send (boolean)
             Line wrap automatically on send.  Default: true.

     preserve_mimetype (boolean)
             Send message Content-Type through to browser. If false,
             Content-Type is replaced with
             ‘application/octet-stream’ which should force download
             to local disk, bypassing any automatic processing of
             bodyparts by the User-Agent. Unclear at the moment
             whether we need to do this, or whether this should be
             done selectively based on the User-Agent.  Default:
             true.

     use_sent_mail (boolean)
             Make the “Save copy” checkbox on the compose screen
             checked default.  Default: true.

     use_mark_persist (boolean)
             Use persistent mark for aggregate operations.  Default:
             false.

     use_search_zoom (boolean)
             Zoom automatically after sucessful search Default:
             true.

     use_agg_unmark (boolean)
             Unmark messages after sucessful aggregate operation.
             Default: true.

     use_icons (boolean)
             Use icons: may be overriden by value of User-Agent.
             Default: true.

     use_welcome (boolean)
             Enable welcome screen .  Default: true.

     use_tail_banner (boolean)
             Duplicate banner icons (toolbar) at the bottom of the
             Message screen.  Default: true.

   Hidden preferences
     The following options are internally handled as user prefer‐
     ences, but the Preferences screen no longer provides any means
     for changing them.

     use_cookie (boolean)
             Use HTTP cookie for Session-ID, if the browser supports
             cookies If disabled, or user rejects the cookie, then
             the session-ID is stored in the URL.  Default: true.

     use_substitution (boolean)
             Use page substiution rather than HTTP redirects.
             Faster, but the URLs that are generated are less pre‐
             dictable.  Page substitution and browser history mecha‐
             nism don't coexist well at the moment (Prayer would
             need to cache final page value for each substiution
             event).

             Default: true.

     use_http_1_1 (boolean)
             Allow HTTP/1.1, if the browser supports it.  Default:
             true.

     use_pipelining (boolean)
             Allow HTTP/1.1 pipelining, if the browser supports it.
             Default: true.

     use_persist (boolean)
             Allow persistent HTTP/1.1 and HTTP/1.0 persistent con‐
             nections, if the browser supports them.  Default: true.

     use_short (boolean)
             Allow short URLs, if the browser supports them.
             Default: true.

     use_gzip (boolean)
             Allow gzip compression, if the browser supports it.
             Default: true.

SEE ALSO
     prayer(8), prayer-session(8)

AUTHORS
     This manual page was put together by Magnus Holmgren
     <holmgren@debian.org> using documentation written by
     David Carter <dpc22@cam.ac.uk>.

The Prayer Webmail Interfac17 August 200The Prayer Webmail Interface
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