Changes to
                      The RAND MH Message Handling System:
                               UCI version MH 6.8

                                 John L. Romine

                            Computing Support Group
                 Department of Information and Computer Science
                        University of California, Irvine
                             Irvine, CA  92717-3425


                    This document describes the changes to the
               UCI version of the RAND MH system from MH 6.6 to
               this release of MH 6.8.  This document is meant to
               supplement, not supersede, the standard MH User's
               manual and MH Administrator's manual.

                    Comments concerning this documentation should
               be addressed to the mailbox Bug-MH@ICS.UCI.EDU, or


          The _M_H system described herein is based on the original RAND
          _M_H system.  It has been extensively developed (perhaps too
          much so) by Marshall T. Rose and John L. Romine at the
          University of California, Irvine.  Einar A. Stefferud, Jerry
          N. Sweet, and Terry P. Domae provided numerous suggestions
          to improve the UCI version of _M_H.

               Of course, a large number of people have helped _M_H
          along.  The list of "_M_H immortals" is too long to list here.
          For this release, numerous _M_H-_W_o_r_k_e_r_s sent in fixes and
          other changes.  A handful of courageous _M_H-_W_o_r_k_e_r_s volun-
          teered to beta-test these changes; their help is particu-
          larly appreciated.

                              December 14, 1992

          Changes to MH 6.8                                          2


          The Regents of the University of California wish to make  it
          known that:

               Although each program has been tested by its  con-
               tributor, no warranty, express or implied, is made
               by the contributor or the University  of  Califor-
               nia,  as  to  the  accuracy and functioning of the
               program and related program  material,  nor  shall
               the  fact of distribution constitute any such war-
               ranty, and no responsibility  is  assumed  by  the
               contributor  or  the  University  of California in
               connection herewith.


          In this document, certain formatting conventions are adhered

               The names of UNIX commands, such as _c_o_m_p are  presented
               in _i_t_a_l_i_c_s.

               Arguments to programs, such as `msgs' and `-nobell' are
               delimited by single-quotes.

               Text that should be typed exactly as-is, such  as  com-
               mand  lines  (e.g.,  "folder  -pack"), are delimited by

               UNIX pathnames and envariables, such  as  /usr/uci  and
               $SIGNATURE, are presented in bold font.

                              December 14, 1992

          Changes for MH 6.8                                         3

          _C_H_A_N_G_E_S _F_O_R _M_H _6._8

          This is the current released version of _M_H as of December
          14, 1992.  This release includes a number of bug fixes and
          internal changes to make the code more portable.  Two new
          authentication methods are provided for the POP, and support
          for SVR4 shared libraries is complete.

               The major user-visible change in this release is the
          incorporation of support for multi-media mail as specified
          by the Multi-purpose Internet Mail Extensions (MIME)
          RFC 1341.  This allows you to include things like audio,
          graphics, and the like, in your mail messages.  A new com-
          mand, _m_h_n, has been provided to support MIME and a detailed
          man page is provided in _m_h_n(1).


          The documentation has some general improvements, and the
          READ-ME document has been re-organized to help _M_H adminis-
          trators find the appropriate configuration options for their
          system.  The Makefiles in the papers/ hierarchy have been
          changed to invoke _T_e_X as "tex" (instead of "tex82").

          The following new man pages are also available:

          _m_h_n(1)      _m_h_n helps the user process multi-media mail.

          _m_h_p_a_r_a_m(1)  _m_h_p_a_r_a_m lets the user extract information from
                      the _M_H profile.

          _p_o_p_a_u_t_h(8)  the APOP database administration program (see

          _p_o_p_i(1)     the POP initiator (see below).

          _s_l_o_c_a_l(1)   fully documents _s_l_o_c_a_l.  The _m_h_o_o_k(1) man page
                      now documents only the _M_H receive-mail hooks.

          _I_n_t_e_r_n_a_l _C_h_a_n_g_e_s

          The _M_H source code is in the process of being cleaned up to
          make pedantic ANSI C compilers happy.  Occurrences of "NULL"
          have been replaced by "0" where appropriate.  Extra tokens
          after "#else" and "#endif" have been put inside comments
          (this is still in progress).  The code should now compile
          cleanly on many more systems, specifically, more variants of

               The version of tws/dtimep.c which was included in MH
          6.7.2 was incompatible with the _l_e_x library on some systems,
          and has been removed.

               A bug in the handling of blind lists inside alias files

                              December 14, 1992

          Changes for MH 6.8                                         4

          has been fixed.

          _P_o_s_t _O_f_f_i_c_e _P_r_o_t_o_c_o_l

          There were three new options added to the POP.

          APOP  This option indicates that the POP daemon will support
                the   non-standard   APOP  command  which  provides  a
                challenge-based authentication system  using  the  MD5
                message digest algorithm.

                This option also causes the _p_o_p_a_u_t_h program to be  in-
                stalled,  which allows the administrator to manipulate
                the APOP authorization database.

          KPOP  Support for KERBEROS with POP.  This code builds _p_o_p_d,
                _i_n_c and _m_s_g_c_h_k to support only the "kpop" protocol.
                This code is still expiremental, but is available for
                those sites wishing to test it.

          MPOP  This option indicates that the POP daemon will support
                the non-standard XTND SCAN command which provides per-
                formance enhancements when using the POP over low-
                speed connections.

                This option also causes an interactive POP client pro-
                gram, _p_o_p_i, to be compiled and installed.  A man page
                for the _p_o_p_i program is also provided.  This option
                requires the configuration to have "bboards: pop".

          The APOP and MPOP non-standard POP facilities are documented
          in _T_h_e _I_n_t_e_r_n_e_t _M_e_s_s_a_g_e (ISBN 0-13-092941-7), a book by
          Marshall T. Rose.  For more details, see support/pop/pop-
          more.txt and the _A_d_m_i_n_i_s_t_r_a_t_o_r'_s _G_u_i_d_e.  The APOP option
          peacefully co-exists with the standard POP, KPOP completely
          replaces the standard POP, and MPOP requires "bboards: pop".

          _F_i_l_e _L_o_c_k_i_n_g

          The file locking code has been cleaned up to support three
          kinds of kernel-level file locking.  As appropriate for your
          system, include the LOCKF, FCNTL or FLOCK option.  For more
          details, see _m_h-_t_a_i_l_o_r(5).

                              December 14, 1992

          Changes for MH 6.8                                         5

          Configuration Directives

          A number of new configuration directives have been added  or
          changed.  The full details are given in the READ-ME.

          cp:        The command used to  install  new  files  if  not

          ln:        The command used to link files  together  in  the
                     source tree if not "ln".

          mts:       Full support for ZMAILER has been added.

          popdir:    The directory where _p_o_p_d will be installed if not

          regtest:   Set to "on" to prevent the hostname  and  compile
                     date from being included in _M_H binaries.

          sharedlib: You may now specify "sun4" or "sys5"  (for  SVR4)
                     shared libraries.

          signal:    Specifies the base type of the function  returned
                     by  _s_i_g_n_a_l().   This  was previously defined with
                     "options TYPESIG".

          Several `-D' options to _c_c have been added or changed:

          APOP       Authenticated POP (see above).

          AUX        Support for A/UX systems.

          DBMPWD     The DBM option has been renamed DBMPWD.

          HESIOD     Support for the HESIOD name server.

          KPOP       KERBEROS POP (see above).

          LOCALE     Support for local characters sets; uses the _s_e_t_-
                     _l_o_c_a_l() function.

          MAILGROUP  Makes _i_n_c set-group-id.  You may need this option
                     if your /usr/spool/mail is not world-writeable.

          MIME       Multi-media mail.

          MPOP       Mobile POP (see above).

          MSGID      Enables _s_l_o_c_a_l to detect and surpress duplicate

          OSF1       Support for DEC OSF1 systems.  May be incomplete.

          RENAME     Include this option if your system has a _r_e_n_a_m_e()

                              December 14, 1992

          Changes for MH 6.8                                         6

                     system call.

          SVR4       Support for System 5 Release 4 or newer systems.

          TYPESIG    This option has been dropped.  See `signal'

          UNISTD     Include this option if your system has the
                     include file <unistd.h>.

          VSPRINTF   Include this option if your system has the
                     _v_s_p_r_i_n_t_f() library routine; otherwise, __d_o_p_r_n_t()
                     will be used.

          YEARMOD    Forces the _m_h-_f_o_r_m_a_t `year' function to return
                     2-digit values.  Use this option during a brief
                     transition period if you have local _m_h-_f_o_r_m_a_t
                     files which need to be converted to support 4-
                     digit years.

          _F_U_N_C_T_I_O_N_A_L _C_H_A_N_G_E_S

          In addition to the configuration changes mentioned above, a
          number of functional changes have been made to the system.
          Many programs have new features added and a few new programs
          have are provided. Each command's manual page gives complete
          information about the its operation.  Here is a short sum-
          mary of the changes.

          _M_H _S_e_q_u_e_n_c_e_s

          A larger number of user-defined sequences are available.
          Previously, this number had been 10.  On 32-bit systems, 26
          user-defined sequences are available.

          _P_r_o_f_i_l_e _C_o_m_p_o_n_e_n_t_s

          _M_H programs will now complain if the .mh_profile does not
          end in a newline.  Also, one enhancement and one new profile
          component are provided:

          Aliasfile:  Multiple filenames may now be given.

          Inbox:      New; the default folder (for _i_n_c, etc.) if not

                              December 14, 1992

          Changes for MH 6.8                                         7

          _F_o_r_m_a_t _S_t_r_i_n_g_s

          A few minor bugs were fixed in format string handling, and a
          few  new features were added.  See _m_h-_f_o_r_m_a_t(5) for complete

          Addresses      An  attempt  is  made   to   decipher   X.400
                         RFC 987-style addresses.

          Comments       Comments may be added to _m_h-_f_o_r_m_a_t  files;  a
                         comment  begins with the 2-character sequence
                         "%;", and ends with an un-escaped newline.

          %(modulo n)    The `modulo' function escape has been added.

          %(year{date})  The date parser has been enhanced  to  under-
                         stand  more  illegal date formats; `year' now
                         returns a 4-digit number.

          _U_s_e_r _I_n_t_e_r_f_a_c_e _P_r_o_g_r_a_m_s

          A number of _M_H commands have minor changes:

          ali       The output with `-user -list' was changed to match
                    the output with `-nouser -list'.

          burst     Will no longer drop the last message of a digest.

          inc       Accepts the `-apop' switch for authenticated POP
                    (see above); will attempt to detect write errors
                    (e.g., no space left on device) when incorporating
                    mail; no longer replaces newline characters with

          folder    The `-noprint' option was broken and has been

          forw      Supports `-mime' to use MIME-style multi-part mes-

          mhl       Will no longer put an extra space at the end of
                    the `%{text}' in a formatfield.

          mhn       New; manipulates multi-media (MIME) messages; a
                    detailed man page is provided.

          mhparam   New; reads the _M_H profile (and context) and writes
                    the values of the specified components on the
                    standard output; useful in programmatic con-

          msgchk    Supports `-apop' (see above).

                              December 14, 1992

          Changes for MH 6.8                                         8

          packmbox  New; packs an _M_H folder into a UUCP-style mailbox.

          popi      New; a client-side POP initiator; available only
                    if you built _M_H with the MPOP option (see above).

          refile    A bug where the `rmmproc' did not remove all
                    specified message files has been fixed.

          scan      The `-file' option is fully supported and will no
                    longer complain about empty folders.

          send      Supports `-mime' and `-split' to split large mes-
                    sages into multiple partial messages using MIME.

          _S_u_p_p_o_r_t _P_r_o_g_r_a_m_s

          fmtdump   Can now read a format file, or a format string
                    given on the command line.

          popauth   New; manages the APOP authorization database (see

          sendmail  The _s_e_n_d_m_a_i_l replacement will be installed only if
                    your `mts' setting uses the `/smtp' option.

          slocal    A new man page for _s_l_o_c_a_l is available; the new
                    `mbox' action is available to write a file in
                    _p_a_c_k_f format; a bug where extra `>' characters
                    were written to MMDF-style maildrops has been
                    fixed; if compiled with the MSGID option, can
                    detect and suppress reception of duplicate mes-

          viamail   New; bundles a directory (like _s_h_a_r) and sends it
                    through multi-media mail.

                              December 14, 1992

          Changes for MH 6.7.2                                       9

          _C_H_A_N_G_E_S _F_O_R _M_H _6._7._2

          The MH.6.7.2 patch release is a maintenance release.  This
          is the current released version of _M_H as of February 1,

               This release now supports the NCR Tower running SYS5R4.
          The WP changes installed in MH.6.7.0 have been removed.

          _S_h_a_r_e_d _L_i_b_r_a_r_i_e_s

          Support for SYS 5 shared libraries is in progress.

               Support for Sun OS 4.0 shared libraries had been
          improved.  The _M_H library has been modified to move initial-
          ized data into a data definition file.  The shared library
          will now consist of a libmh.so and libmh.sa file.  The
          shared library version number will no longer track the _M_H
          patch release number, and its numbering begins with version
          `1.1' with this release.

          _R_e_p_l_a_c_e_m_e_n_t _S_e_n_d_M_a_i_l

          Since many standard system programs expect to post mail by
          invoking /usr/lib/sendmail, a minimal replacement _S_e_n_d_M_a_i_l
          is provided in this release.  This replacement is meant to
          be installed on (e.g., diskless) client workstations which
          post mail using SMTP, and do not run a message transport
          system.  It will call _p_o_s_t to post mail; be sure you have
          configured _M_H with the `/smtp' mts option.  This sendmail
          replacement is installed in your _M_H etc directory, and you
          should link /usr/lib/sendmail to it.

          _F_o_r_m_a_t _S_t_r_i_n_g_s

          A manual page for the _f_m_t_d_u_m_p format string disassembler  is
          supplied, and some new format functions were added:

          folder   In _s_c_a_n, this component escape contains the name of
                   the current folder.  It is not defined for other _M_H

          getenv   This function escape returns the value  of  an  en-
                   vironment variable.

               There will be some additional changes in these routines
          in the next patch release.

                                  Feb 1, 1992

          Changes for MH 6.7.2                                      10

          _O_t_h_e_r _B_u_g _F_i_x_e_s _a_n_d _E_n_h_a_n_c_e_m_e_n_t_s

          In addition to some other minor enhancements, some bugs were
          fixed which in general were not user-visible:

          Blind lists   Users may now specify RFC822 address groups in
                        their  alias  files.   These groups are imple-
                        mented by _M_H as blind lists.

          date parsing  A number of sites have brain-damaged  versions
                        of lex.  _M_H will now come with the date parser
                        already run through lex.

          mark          A bug dealing with _m_a_r_k and the sequence named
                        `cur' is fixed.  This was previously a problem
                        for mh-e users.

          MH.doc        The _M_H nroff version of the manual  no  longer
                        contains teletype escape sequences.

          scan          Can now handle headers as long as 512 bytes.

          Signals       _M_H programs will no longer catch the  HUP  and
                        TERM  signals while waiting for a sub-process.
                        This was causing hung processes when your ter-
                        minal line was was dropped unexpectedly.

          Signature     If your signature is not defined, _M_H will  use
                        the   value   of   the  gecos  field  of  your
                        /etc/passwd entry as your signature.

          version.sh    A bug in the awk script  in  config/version.sh
                        was fixed.

                                  Feb 1, 1992

          Changes for MH 6.7.1a                                     11

          _C_H_A_N_G_E_S _F_O_R _M_H _6._7._1_a

          The MH.6.7.1a patch was made available on January 25, 1991
          for limited distribution only.  (This release had some known
          bugs, and so was not widely distributed.) This release
          incorporates several new features of particular note to
          users of sequences and format strings, as well as some gen-
          eral documentation improvements.  There are a few minor
          enhancements and internal bug fixes also.  Complete documen-
          tation of these changes is given in the individual manual
          pages, and the READ-ME file.

          _M_e_s_s_a_g_e _S_e_q_u_e_n_c_e_s

          A new manual page, _m_h-_s_e_q_u_e_n_c_e (5), has been added.  This
          manual page attempts to completely document the syntax and
          semantics of _M_H message sequence specifications.

               A powerful new feature is the ability to specify mes-
          sage ranges with user-defined sequences.  The  specification
          "name:n" may be used, and it designates up to the first `n'
          messages (or  last  `n' messages  for  `-n') which  are
          elements  of the user-defined sequence `name'.

               The message specifications "name:next" and "name:prev"
          may also be used, and they designate the next or previous
          message (relative to the current message) which is an ele-
          ment of the user-defined sequence `name'.  The specifica-
          tions "name:first" and "name:last" are equivalent to
          "name:1" and "name:-1", respectively.  The specification
          "name:cur" is not allowed (use just "cur" instead).

               These specifications allow the user to step through a
          sequence with a command like "show name:next".

          _F_o_r_m_a_t _S_t_r_i_n_g_s

          _M_H format strings now support an if-then-elseif-else clause
          (the `elseif' is new).  This will make format strings with
          multi-case conditions somewhat less complex.

               A new format function `addr' had been added.  This
          function takes an address header name as its argument, and
          returns a rendering of the address contained in that header
          as "user@host" or "host!user".

               Format widths now may be specified as a negative
          number.  This causes the output to be right-justified within
          the format width.

                                January 25, 1991

          Changes for MH 6.7.1a                                     12

          _O_t_h_e_r _C_h_a_n_g_e_s

          Along with a few minor enhancements, some  bugs  were  fixed
          which in general were not user-visible:

          fmtdump  This  new  program  produces   an   pseudo-language
                   representation of an _M_H format file, vaguely remin-
                   iscent of assembly  language.   While  this  output
                   format  is  not explicitly documented, it can still
                   be useful when debugging _M_H format files.

          refile   Now takes a `-[no]rmmproc' switch.  This  makes  it
                   easier to avoid loops when your "rmmproc" calls _r_e-

          slocal   A  problem  with  the  UUCP-style  mailboxes,   the
                   `RPATHS'  configuration  option,  and  the "Return-
                   Path:" header was fixed.

          sortm    Will ensure that no messages are lost if it is  in-

          whatnow  Will now tell you where it is  leaving  the  draft,
                   when  interrupted  in the initial edit.  Previously
                   the draft was simply unlinked.

          _C_o_m_p_i_l_a_t_i_o_n _O_p_t_i_o_n_s

          LOCKF    This option causes _M_H to  use  the  lockf()  system
                   call   for   locking  (if  available),  instead  of

                                January 25, 1991

          Changes for MH 6.7.1                                      13

          _C_H_A_N_G_E_S _F_O_R _M_H _6._7._1

          The MH.6.7.1 patch release is a maintenance release, and as
          such, provides few changes from the previous release.  This
          is the current released version of _M_H as of December 14,

          _U_s_e_r-_V_i_s_i_b_l_e _C_h_a_n_g_e_s

          The major change in this release is to the POP daemon
          (popd).  In _M_H 6.7, it was changed to be able to read both
          UUCP and MMDF-style mailboxes.  This did not work as
          reported.  The code has now been changed to parse MMDF-style
          mailboxes if you are configuring MH to run with MMDF as your
          message transport system.  Otherwise, UUCP-style mailboxes
          are expected.

               Since there are number of client programs available for
          only the POP2 protocol instead of POP3, popd has been
          updated to support both protocols.  This is a major win.  If
          you are compiling with POP turned on, add the `POP2' option
          to your _M_H config file, and the POP daemon will respond to
          POP2 or POP3 commands.  If you're using POP, there's no rea-
          son not to include this option; it does not affect the
          existing support for POP3.

          _I_n_t_e_r_n_a_l _C_h_a_n_g_e_s

          Some bugs were fixed which in general were not user-visible:

          context     Errors when writing out sequences  are  detected

          inc         No longer inserts extra blank  lines  into  mes-

          mh-format   A nil pointer bug  in  the  address  parser  was

          repl, etc.  The malloc/free problem has been fixed.

          rmf         A spelling error in the `-nointeractive'  switch
                      has been corrected.

          rcvtty      Will not print the message size if not available
                      (i.e., zero).

          send/post   Illegal signatures  (those  containing  unquoted
                      "."s) will be quoted.

                               December 14, 1990

          Changes for MH 6.7.0                                      14

          _G_E_N_E_R_A_L _C_H_A_N_G_E_S _F_O_R _M_H _6._7._0

          The author is pleased to announce that there are very few
          user-visible changes to _M_H 6.7 from the previous _M_H 6.6 dis-
          tribution.  The majority of development was in the form of
          bug fixes and slight enhancements.  In addition, this
          release is slightly faster than the previous release.  With
          a few minor exceptions, it is backward-compatible with the
          previous release.  _M_H 6.7.0 is the current released version
          of _M_H as of April 12, 1990.

               The changes were made mainly to generalize the source
          code to be compatible with a larger range of systems and
          compilers.  There were many small changes to add declara-
          tions for ANSI C compliance.  The System 5 support has been
          brought up to SYS5 R3, and there is support for Sun OS 4.0.

          _U_s_e_r-_V_i_s_i_b_l_e _C_h_a_n_g_e_s

          Here a quick summary of the changes that were made which are
          not backward-compatible with the previous release of _M_H:

          repl   The `-format' and `-noformat' switches have not been
                 functional since _M_H 5, and have been removed.  Any
                 users who have these switches in their .mh_profile,
                 will have to remove them.

          sortm  Previously, in most cases _s_o_r_t_m would fill-in any
                 gaps in the numbering of a folder, by renumbering the
                 messages starting with `1'.  This will no longer
                 occur; for this behavior, use "folder -pack".

          _U_s_i_n_g _A_l_i_a_s_e_s

          A new profile entry `Aliasfile:' has been added.  The _a_l_i,
          _s_e_n_d, and _w_h_o_m programs will look for this profile entry and
          treat it as they would an argument to `-alias'.  This should
          make it easier for novice _M_H users to begin using aliases.

          _R_e_a_d_i_n_g _N_e_t_w_o_r_k _N_e_w_s & _B_B_o_a_r_d_s

          The UCI BBoards facility can read local BBoards, and if com-
          piled with the `bboards: pop' and `pop: on' options, can
          also read remote BBoards using the Post Office Protocol (POP
          ver. 3).  With this release, _M_H can instead be compiled to
          read the Network News (i.e., USENET) using the Network News
          Transfer Protocol (NNTP).

               This capability is enabled by compiling _M_H with the
          `bboards: nntp' and `pop: on' options.  Unfortunately, read-
          ing remote BBoards via the POP and reading the Network News
          via the NNTP are mutually exclusive options.

                                 April 12, 1990

          Changes for MH 6.7.0                                      15

               To support the NNTP, a new module, uip/pshsbr.c, is
          compiled and loaded into _b_b_c and _m_s_h instead of
          uip/popsbr.c.  The default BBoard is changed from "system"
          to "general" for the NNTP.

               When reading BBoards, _b_b_c will first look for local
          BBoards, and then contact the NNTP server to read the Net-
          work News.  The location of the NNTP server should be speci-
          fied with the `nntphost:' entry in the mtstailor file (see
          the _M_H Administrator's Guide for details), or may be speci-
          fied on the command line with the `-host' switch.

          _F_o_r_m_a_t _S_t_r_i_n_g_s

          The manual page _m_h-_f_o_r_m_a_t (5) has been rewritten to give a
          better explanation of how to write format strings, and how
          they are interpreted by _M_H.  A line-by-line description of
          the default _r_e_p_l form file (replcomps) is now included in
          that manual page.

          Some new format functions were added, and others  were  aug-

          trim        Strips any leading and trailing white-space from
                      the current string value.

          date2local  Will coerce the date to the local timezone.

          date2gmt    Will coerce the date to GMT.

          divide      Divides the current numeric value by  its  argu-
                      ment.   This  could  be useful for building _s_c_a_n
                      format strings which print large  message  sizes
                      in "Kb" or "Mb".

          friendly    If the address  field  cannot  be  parsed,  this
                      function  will  return  the  text of the address
                      header, instead of a null string.

          szone       A flag indicating whether the timezone  was  ex-
                      plicit in the date string.

          _P_R_O_G_R_A_M _C_H_A_N_G_E_S

          In addition to the general changes mentioned above, many
          programs have specific new features added, either by new
          switches or by expanded functionality.  Each command's
          manual page gives complete information about its new
          options.  Here is a short summary.

          _U_s_e_r _I_n_t_e_r_f_a_c_e _P_r_o_g_r_a_m_s

          anno      Accepts a `-nodate' switch which inhibits the date

                                 April 12, 1990

          Changes for MH 6.7.0                                      16

                    annotation, leaving only the body annotation.

          folder    When invoked with the `-pack' switch and the new
                    `-verbose' switch, _f_o_l_d_e_r will give information
                    about the actions taken to renumber the folder.

                    On most systems, _f_o_l_d_e_r can now create any
                    non-existing parent folders of a new sub-folder.

          forw      When making digests, _f_o_r_w will put the issue and
                    volume numbers in addition to the digest list
                    name, in the digest trailer.

          inc       Detects NFS write failures, and will not zero your
                    maildrop in that event.

          msh       Supports a variant of the new _s_o_r_t_m.

          prompter  Considers a period on a line by itself to signify
                    end-of-file when the `-doteof' switch is speci-

          repl      The `-[no]format' switches have not been used
                    since _M_H 5 and have been deleted. _r_e_p_l will now
                    find filter files in the _M_H library area.

          scan      With the `-file msgbox' switch, _s_c_a_n can list a
                    _p_a_c_k_f'd-format file directly (without using _m_s_h).

                    Lists messages in reverse order with the
                    `-reverse' switch.  This should be considered a

          sortm     Now has the options: `-textfield field', `-notext-
                    field', `-limit days', and `-nolimit'.

                    With these options, _s_o_r_t_m can be instructed to
                    sort a folder based on the contents of an arbi-
                    trary header such as "subject".

                    _s_o_r_t_m minimizes renaming messages, and will no
                    longer arbitrarily pack folders; for this
                    behavior, use "folder -pack".

          whatnow   Deletes the draft by renaming it with leading
                    comma, instead of unlinking it.

          _M_H _S_u_p_p_o_r_t _P_r_o_g_r_a_m_s

          The following support programs also have changes or enhance-

          mhl     Will now accept a format string  on  any  component,
                  not just on addresses and dates.

                                 April 12, 1990

          Changes for MH 6.7.0                                      17

          popd    Will use _s_h_a_d_o_w passwords if compiled with the SHA-
                  DOW option.  It can now also read UUCP-style mail-
                  drops directly.

          rcvtty  If given no arguments, _r_c_v_t_t_y will produce a scan
                  listing as specified by a format string or file; a
                  default format string is used if one is not speci-

                  Before the listing is written to the users terminal,
                  the terminal's bell is rung and a newline is output.
                  The `-nobell' and the `-nonewline' options inhibit
                  these functions.

                  _r_c_v_t_t_y will obey terminal write notification set by
                  _m_e_s_g.  With the `-biff' switch, _r_c_v_t_t_y will also
                  obey the mail notification status set by _b_i_f_f.

                  On BSD43 systems, as with _w_r_i_t_e, _r_c_v_t_t_y will be
                  installed set-group-id to the group "tty".

          slocal  Understands UUCP-style "From " lines and will write
                  output files using this format if appropriate.
                  Before invoking a delivery program, _s_l_o_c_a_l will
                  strip such lines unless compiled with the RPATHS
                  option, in which case it will will convert such
                  lines into "Return-Path:" headers.

                  _s_l_o_c_a_l has a new result code "N", for use in .mail-
                  delivery files.  With this result code, _s_l_o_c_a_l will
                  perform the action only if the message has not been
                  delivered and the previous action succeeded.  This
                  allows for performing an action only if multiple
                  conditions are true.


          Several of the older _M_H papers have been difficult to format
          because they depended on an older version of PhDTeX which
          was not supplied.  These papers have been updated, and some
          TeX library files are supplied in papers/doclib/, so that
          these papers may be generated on any system with TeX.

               Many of the manual pages have been revised to include
          documentation of new command options, and some have been
          expanded to give more detail.  All are now slightly refor-
          matted at installation time to make them more compatible
          with programs like _m_a_k_e_w_h_a_t_i_s.

          _M_H _A_D_M_I_N_I_S_T_R_A_T_I_O_N

          This section describes changes in configuring, compiling and
          installing _M_H 6.7 and should not be of interest to casual _M_H

                                 April 12, 1990

          Changes for MH 6.7.0                                      18

          users.  The READ-ME file has been considerably revised and
          expanded to give more detail about the configuration and
          compilation options which have been included in this
          release.  Some compilation options have been removed, and
          many new options have been added.

               All _M_H Makefiles have been updated to work around some
          incompatibilities introduced in newer versions of _m_a_k_e.  _M_H
          programs will no longer be installed with the sticky-bit
          turned on.

               Reading this section not a substitute for carefully
          reading the READ-ME file before attempting to compile _M_H

          _B_u_g _F_i_x_e_s

          Some bugs were fixed which in general were not user-visible:

          address parser  Fixed to allow use of the "AT"  domain,  and
                          some minor bugs were fixed pertaining to ad-
                          dress groups.

          date parser     Improved to accept  more  forms  of  illegal
                          dates.  Military timezones were removed.

          dynamic memory  Many problems with corruption of the dynamic
                          memory pool have been fixed.

          locking         Will open files for write, if  necessary  to
                          enable locking.

          nil pointers    All reported nil pointer problems have  been

          replcomps       The "In-Reply-To:" header had  quotes  added
                          around the date field to comply with RFC822.

          _W_h_i_t_e _P_a_g_e_s

          If _M_H is compiled with the WP option, _s_e_n_d recognizes an
          address between "<<" and ">>" characters such as:

                  To: << rose -org psi >>

          to be a name meaningful to a whitepages service.  In order
          to expand the name, _s_e_n_d must be invoked interactively
          (i.e., not from _p_u_s_h).  For each name, _s_e_n_d will invoke a
          command called _f_r_e_d in a special mode asking to expand the

               To get a copy of the white pages service, contact

                                 April 12, 1990

          Changes for MH 6.7.0                                      19

          _C_o_n_f_i_g_u_r_a_t_i_o_n _O_p_t_i_o_n_s

          Some configuration options have been added or changed:

          cc          To specify an alternate C compiler.

          ccoptions   Defaults to `-O'.

          bboards     May now be defined as "on", "off", "pop", or

          bbdelivery  Determines whether the bboard delivery agent and
                      library files should be installed.

          lex         To specify an alternate version of _l_e_x.

          mailgroup   If defined, _i_n_c will be made set-group-id to
                      this group.

          sharedlib   For SUN40 systems; if "on", makes libmh.a into a
                      shared library.

          slibdir     The directory where the above shared library
                      should be installed.

          sprintf     Set this to "int" if that's what your
                      _s_p_r_i_n_t_f (3) library routine returns.

          _C_o_m_p_i_l_a_t_i_o_n _O_p_t_i_o_n_s

          For different configurations, several `-D' options to _c_c
          have been added or changed:

          BERK        This disables the address and date parsing rou-
                      tines.  If you want to do much with
                      _m_h-_f_o_r_m_a_t (5), don't enable this.

          BSD43       Will make _r_c_v_t_t_y set-group-id to the group

          DBM         For sites with a dbm-style password file (such
                      as with Yellow Pages), _M_H will not read the
                      entire passwd file into a cache.  At one site
                      that runs YP on a large passwd file, using this
                      showed a 6:1 performance improvement.

          NETWORK     This option has been deleted.  See SOCKETS.

          NOIOCTLH    Tells _M_H not to include the file sys/ioctl.h.
                      Use this if this file is not present on your

          NTOHLSWAP   On systems with TCP/IP networking, _m_s_h will try
                      to use the ntohl() macro from the file

                                 April 12, 1990

          Changes for MH 6.7.0                                      20

                      netinet/in.h to byte-swap the binary map files
                      it writes.

          SENDMAILBUG Some versions of _s_e_n_d_m_a_i_l return a 451 (failure)
                      reply code when they don't mean to indicate
                      failure.  This option considers that code to be
                      equivalent to 250 (OK).

          SHADOW      Causes _p_o_p_d to read the file /etc/shadow for
                      encrypted passwords instead of /etc/passwd.  Use
                      this if you have a shadow password file (such as
                      on newer versions of SYSTEM 5).

          SOCKETS     Enable this if you are on a non-BSD system with
                      a socket interface for TCP/IP networking compa-
                      tible with 4.2BSD UNIX.

          SUN40       Use on Suns running Sun OS 4.0 and later.

          SYS5        This option has been updated to refer to SYS5 R3
                      and later systems.

          SYS5DIR     Use this if your system uses "struct dirent"
                      instead of "struct direct".  This should be true
                      for systems based on SYS5 R3 and later.

          TYPESIG     Defines the base type for the _s_i_g_n_a_l system
                      call.  This defaults to "int", but should be
                      defined as "void" if appropriate for your sys-

          WP          Enables support for the White Pages service.


          _M_H will now explicitly set the protection mode on every file
          it installs.

               Previously any existing file installed by _M_H would be
          backed up into the source tree, and then overwritten.  Now,
          a few system-dependent files will not be overwritten, and
          your changes will have to be merged in by hand.  See the
          READ-ME file for more details.

                                 April 12, 1990