Updated to match src.

@@ -30,14 +30,30 @@ inconvenient to specify them in the command line each time you run
 a mailutils utility. The @dfn{configuration files} provide a way to
 a mailutils utility. The @dfn{configuration files} provide a way to
 add default command line arguments without having to type them in
 add default command line arguments without having to type them in
 the command line. Upon startup, each mailutils utility scans and
 the command line. Upon startup, each mailutils utility scans and
-processes the contents of the three startup files: the site-wide
-configuration file @file{mailutils.rc}, the user-specific configuration
-file @file{.mailutils}, and the program-specific configuration
-file @file{.mu.@var{program}rc} (where @var{program} means the
-program name). The site-wide configuration file is searched
-in your system configuration directory (usually, @file{/etc} or
-@file{/usr/local/etc}), the user-specific and program-specific
-configuration files are searched in the user's home directory.
+processes the contents of the three startup files, none of which
+are required to exist:
+
+@enumerate
+@item
+the site-wide configuration file
+
+@file{mailutils.rc}, found in your your system configuration directory
+(usually @file{/etc} or @file{/usr/local/etc}).
+
+@item
+the user-specific configuration file
+
+Usually @file{~/.mailutils}, unless @file{~/.mailutils} is a directory,
+in which case @file{~/.mailutils/mailutils} is used.
+
+@item
+the programs-specific configuration file
+
+Usually @file{~/.mu.@var{program}rc}, unless @file{~/.mailutils} is a
+directory, in which case @file{~/.mailutils/@var{program}rc} is used
+(where @var{program} means the program name).
+
+@end enumerate
 
 
 These files have simple line-oriented syntax. Comments begin with the
 These files have simple line-oriented syntax. Comments begin with the
 pound sign (@samp{#}) and extend through the end of the line
 pound sign (@samp{#}) and extend through the end of the line
@@ -46,20 +62,20 @@ should be separated from the previous word by any amount of whitespace.}.
 Very long lines may be split across several lines by escaping final newline
 Very long lines may be split across several lines by escaping final newline
 with a backslash (@samp{\}) character.
 with a backslash (@samp{\}) character.
 
 
-In the non-program-specific configuration files, any non-comment line
+In the non-program-specific configuration files, any configuration line
 must start with a @dfn{tag}. In the program-specific configuration
 must start with a @dfn{tag}. In the program-specific configuration
-file the tag must not be present, all options are for the specific
+file the tag must not be present, all options are for that specific
 program.
 program.
 
 
 A tag is either a name of a particular mailutils utility or @dfn{option
 A tag is either a name of a particular mailutils utility or @dfn{option
 group}, prefixed with colon (@samp{:}). The command line options common for
 group}, prefixed with colon (@samp{:}). The command line options common for
 several mailutils programs are divided into @dfn{option groups} or
 several mailutils programs are divided into @dfn{option groups} or
 @dfn{capabilities}, e.g. the options @option{--mail-spool} and
 @dfn{capabilities}, e.g. the options @option{--mail-spool} and
-@option{--license} form group @samp{mailutils}. These groups are discussed
+@option{--lock-flags} form group @samp{mailbox}. These groups are discussed
 in detail below.
 in detail below.
 
 
-When processing the non-program-specific configuration files
-(@file{mailutils.rc} and @file{.mailutils}), a mailutils utility selects
+When processing the non-program-specific configuration files,
+a mailutils utility selects
 those lines whose tag is either the name of that utility or the name
 those lines whose tag is either the name of that utility or the name
 of the option group supported by it. In the program-specific configuration
 of the option group supported by it. In the program-specific configuration
 file, all lines are selected. For each line found, its tag (if present)
 file, all lines are selected. For each line found, its tag (if present)
@@ -68,7 +84,7 @@ These words are regarded as command line options and are inserted to
 the program arguments @emph{before} any options from the command line.
 the program arguments @emph{before} any options from the command line.
 Thus the options from @file{.mailutils} take precedence over those
 Thus the options from @file{.mailutils} take precedence over those
 from @file{mailutils.rc}, and the options from the command line take
 from @file{mailutils.rc}, and the options from the command line take
-precedence over those from both configuration files.
+precedence over those from all three configuration files.
 
 
 The word splitting occurs at whitespace characters and is similar to
 The word splitting occurs at whitespace characters and is similar to
 that performed by the shell. If an option must contain embedded
 that performed by the shell. If an option must contain embedded
@@ -76,25 +92,16 @@ whitespace, it should be enclosed in a pair of quotes (either double
 or single quotes).
 or single quotes).
 
 
 @menu
 @menu
-* mailutils::           Options common for all utilities.
-* daemon::              Options common for daemon programs.
-* auth::                Authentication-specific options.
-* logging::             Logging control options.
-* config sample::       A sample configuration file.
+* default::        Options understood by most GNU utilities.
+* mailbox::        Specifies the mail spool location, and locking strategy.
+* daemon::         Options common for daemon programs.
+* auth::           Authentication-specific options.
+* logging::        Logging control options.
+* config sample::  A sample configuration file.
 @end menu
 @end menu
 
 
-@node mailutils
-@subsection mailutils --- Options common for all utilities.
-@cindex :mailutils
-
-Option group @samp{mailutils} consists of options common for all
-utilities in the package:
-
-@table @option
-@item -m @var{path}
-@itemx --mail-spool=@var{path}
-Set path to the mailspool directory
-@end table
+@node default
+@subsection default --- Options understood by most GNU utilities.
 
 
 Each program also understands the following informational options:
 Each program also understands the following informational options:
 
 
@@ -113,6 +120,21 @@ Display GNU General Public License and exit.
 Display program version and exit.
 Display program version and exit.
 @end table
 @end table
 
 
+@node mailbox
+@subsection mailbox --- Specifies the mail spool location, and locking strategy.
+@cindex :mailbox
+
+Option group @samp{mailbox} consists of options used to specify the
+location of the mail spool, and the locking strategy.
+
+@table @option
+@item -m @var{path}
+@itemx --mail-spool=@var{path}
+Set path to the mailspool directory
+@item --lock-flags=@var{flags}
+Set the default mailbox lock flags (E=external, R=retry, T=time, P=pid).
+@end table
+
 @node daemon
 @node daemon
 @subsection daemon --- Options common for daemon programs.
 @subsection daemon --- Options common for daemon programs.
 @cindex :daemon
 @cindex :daemon
@@ -195,7 +217,7 @@ facility @samp{local1}.
 
 
 @example
 @example
 @group
 @group
-:mailutils --mail-spool /var/spool/mail
+:mailbox --mail-spool /var/spool/mail
 :auth --pam-service mailutils
 :auth --pam-service mailutils
 :logging --log-facility mail
 :logging --log-facility mail
 imap4d --daemon=20 --timeout=1800 --log-facility local1
 imap4d --daemon=20 --timeout=1800 --log-facility local1
@@ -224,7 +246,7 @@ The server runs as daemon, forking a child for each new connection. This
 mode is triggered by @option{-d} command line switch.
 mode is triggered by @option{-d} command line switch.
 @end table
 @end table
 
 
-The program uses following option groups: @xref{mailutils},
+The program uses following option groups: @xref{mailbox},
 @xref{daemon}, @xref{logging}, @xref{auth}.
 @xref{daemon}, @xref{logging}, @xref{auth}.
 
 
 @subheading Command line options
 @subheading Command line options
@@ -292,7 +314,7 @@ The server runs as daemon, forking a child for each new connection. This
 mode is triggered by @option{-d} command line switch.
 mode is triggered by @option{-d} command line switch.
 @end table
 @end table
 
 
-The program uses following option groups: @xref{mailutils},
+The program uses following option groups: @xref{mailbox},
 @xref{daemon}, @xref{logging}, @xref{auth}.
 @xref{daemon}, @xref{logging}, @xref{auth}.
 
 
 @subheading Command line options
 @subheading Command line options
@@ -340,7 +362,7 @@ user's system mailbox and outputs the contents of @code{From} and
 the command line, the program reads that folder rather than the default
 the command line, the program reads that folder rather than the default
 mailbox.
 mailbox.
 
 
-The program uses following option groups: @xref{mailutils}.
+The program uses following option groups: @xref{mailbox}.
 
 
 The following command line options alter the behavior of the program:
 The following command line options alter the behavior of the program:
 
 
@@ -419,7 +441,7 @@ General usage of @command{mail} program is:
 If [address...] part is present, @command{mail} switches to mail sending
 If [address...] part is present, @command{mail} switches to mail sending
 mode, otherwise it operates in mail reading mode.
 mode, otherwise it operates in mail reading mode.
 
 
-The program uses following option groups: @xref{mailutils}.
+The program uses following option groups: @xref{mailbox}.
 
 
 @command{Mail} understands following command line options:
 @command{Mail} understands following command line options:
 
 
@@ -1628,7 +1650,7 @@ and appends the received data to the local mailboxes.
 @node Invocation
 @node Invocation
 @subsection Invoking mail.local
 @subsection Invoking mail.local
 
 
-The program uses following option groups: @xref{mailutils}, @xref{auth},
+The program uses following option groups: @xref{mailbox}, @xref{auth},
 @xref{logging}.
 @xref{logging}.
 
 
 @table @option
 @table @option
@@ -1776,7 +1798,7 @@ folder, the following output line is produced:
 where @var{folder} represents the folder name, @var{number} represents
 where @var{folder} represents the folder name, @var{number} represents
 the number of messages.
 the number of messages.
 
 
-The program uses following option groups: @xref{mailutils}.
+The program uses following option groups: @xref{mailbox}.
 
 
 The program accepts following command line options:
 The program accepts following command line options:
 
 
@@ -1884,7 +1906,7 @@ It processes mailboxes, applying the user-supplied scheme procedures
 to each of them in turn and saves the resulting output in mailbox
 to each of them in turn and saves the resulting output in mailbox
 format.
 format.
 
 
-The program uses following option groups: @xref{mailutils}.
+The program uses following option groups: @xref{mailbox}.
 
 
 @menu
 @menu
 * Specifying Scheme Program to Execute::
 * Specifying Scheme Program to Execute::
@@ -2260,7 +2282,7 @@ either from @file{inetd.conf} or as a standalone daemon.
 @node Starting comsatd
 @node Starting comsatd
 @subsection Starting comsatd
 @subsection Starting comsatd
 
 
-@command{Comsatd} uses following option groups: @xref{mailutils},
+@command{Comsatd} uses following option groups: @xref{mailbox},
 @xref{daemon}, @xref{logging}.
 @xref{daemon}, @xref{logging}.
 
 
 @table @option
 @table @option