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+ + Changes to + The RAND MH Message Handling System: + UCI version MH 6.8 + + + John L. Romine + + Computing Support Group + Information and Computer Science + University of California, Irvine + Irvine, CA 92717-3425 + Bug-MH@ICS.UCI.EDU + http://www.ics.uci.edu/~mh/ + + + ABSTRACT + + + 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. + Current information about MH can be obtained from + the MH Home Page on the World Wide Web at + http://www.ics.uci.edu/~mh/. + + + + ACKNOWLEDGEMENTS + + The MH system described herein is based on the original RAND + MH 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 MH. + + Of course, a large number of people have helped MH + along. The list of "MH immortals" is too long to list here. + For this release, numerous MH-Workers sent in fixes and + other changes. A handful of courageous MH-Workers volun- + teered to beta-test these changes; their help is particu- + larly appreciated. + + DISCLAIMER + + The Regents of the University of California wish to make it + known that: + + Although each program has been tested by its + contributor, no warranty, express or implied, is + made by the contributor or the University of + California, as to the accuracy and functioning of + the program and related program material, nor + shall the fact of distribution constitute any such + warranty, and no responsibility is assumed by the + contributor or the University of California in + connection herewith. + + CONVENTIONS + + In this document, certain formatting conventions are adhered + to: + + The names of UNIX commands, such as comp are presented + in italics. + + Arguments to programs, such as `msgs' and `-nobell' are + delimited by single-quotes. + + Text that should be typed exactly as-is, such as + command lines (e.g., "folder -pack"), are delimited by + double-quotes. + + UNIX pathnames and envariables, such as /usr/uci and + $SIGNATURE, are presented in bold font. + + + CHANGES FOR MH 6.8.4 + + The MH 6.8.4 release is a minor maintenance release, and + contains few user-visible changes. The changes consist + mostly of documentation improvements, minor bug fixes, and + some portability enhancements for BSD 4.4 and Solaris 2.x + (contributed changes for HPUX and OSF1 have not yet been + integrated into this release). This is the current version + of MH as of February 8, 1996. + + Runtime Tailoring + + By default post will now give the SMTP HELO command with the + local hostname. If you specify a hostname with the + clientname: option in the mtstailor file, post will give the + HELO command with that name instead. If the argument to the + clientname: option is empty, no HELO command is given. See + mh-tailor(5) for more details. + + Multi-media Mail & Encryption + + A few new PGP support programs can be found in the + support/general directory. repl supports the `-[no]mime' + option. See repl(1) for more details. + + + CHANGES FOR MH 6.8.3 + + The MH 6.8.3 maintenance release contains few user-visible + changes. Most of the changes are internal to the multi- + media display program mhn to support RFC 1521 (the new MIME + standard). This is the current version of MH as of December + 1, 1993. + + Runtime Tailoring + + When posting mail using the SMTP, post did not normally send + the HELO command. This was because SendMail would fail if + the host name given in the HELO command was the local host. + Later versions of SendMail will now complain if you omit the + HELO command. + + User Interface Programs + + folder The folder command now has `-create' and `-nocreate' + options. See folder(1) for details. + + inc A bug where `-host' would not override the pophost + as set in the mtstailor file has been fixed. This + bug was also fixed in msgchk. + + mhn The mhn command has several changes: updates for + conformance with RFC 1521, addition of two caches: + public and private, addition of two caching poli- + cies: one for reading and one for writing, support + for storing multipart entities, and a few bug fixes. + See mhn(1) for complete details. + + CHANGES FOR MH 6.8.2 + + The MH.6.8.2 patch release contains only internal changes to + support the BSD 4.4 and 386BSD versions of UNIX. This ver- + sion of MH was released August 25, 1993, but was not widely + distributed. + + CHANGES FOR MH 6.8.1 + + The MH.6.8.1 patch release is a maintenance release. This + is the current released version of MH as of August 20, 1993. + + This release includes a small number of bug fixes, a + few minor enhancements, some changes for the new MIME stan- + dard, and support for ESMTP (RFC 1425). Support for BSD 4.4 + and 386BSD is planned for the next release. + + Many other fixes which have already been received are + still being merged. If you've sent an update for MH 6.8 to + Bug-MH@ics.uci.edu and it isn't in this release, it'll prob- + ably appear in the next release. + + Fixes and Enhancements + + Many minor documentation corrections were made. There are + also a few program changes: + + mhn The `-cache policy', `-[no]check', and `-[no]pause' + switches have been added. Some other minor changes + have been made to comply with the new MIME standard. + See mhn(1) for complete details. + + post When posting mail with SendMail, post will not use the + ONEX command when it is posting a message with BCCs. + + scan scan will now work with big width values. + + Format Strings + + One new function has been added: + + %(profile arg) This function looks up a component in the + .mh_profile or context files and returns the + value of that component. + + Configuration + + Two new configuration options are present: + + GCOS_HACK The so-called "gcos" field of the password file + is used as a last resort to find the user's + full name (see mh-profile(5) for details). + Enable this option if your passwd(5) man page + notes that the `&' character in the "gcos" + field stands for the login name. + + NORUSERPASS Tells MH that your system doesn't have the + ruserpass(3) routine; MH will include its own + copy of this routine in its library. + + + CHANGES FOR MH 6.8 + + This is the current released version of MH 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, mhn, has been provided to support MIME and a detailed + man page is provided in mhn(1). + + Documentation + + The documentation has some general improvements, and the + READ-ME document has been re-organized to help MH adminis- + trators find the appropriate configuration options for their + system. The Makefiles in the papers/ hierarchy have been + changed to invoke TeX as "tex" (instead of "tex82"). + + The following new man pages are also available: + + mhn(1) mhn helps the user process multi-media mail. + + mhparam(1) mhparam lets the user extract information from + the MH profile. + + popauth(8) the APOP database administration program (see + below). + + popi(1) the POP initiator (see below). + + slocal(1) fully documents slocal. The mhook(1) man page + now documents only the MH receive-mail hooks. + + Internal Changes + + The MH 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 + SVR4. + + The version of tws/dtimep.c which was included in MH + 6.7.2 was incompatible with the lex library on some systems, + and has been removed. + + A bug in the handling of blind lists inside alias files + has been fixed. + + Post Office Protocol + + 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 popauth program to be + installed, which allows the administrator to + manipulate the APOP authorization database. + + KPOP Support for KERBEROS with POP. This code builds popd, + inc and msgchk 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, popi, to be compiled and installed. A man page + for the popi program is also provided. This option + requires the configuration to have "bboards: pop". + + The APOP and MPOP non-standard POP facilities are documented + in The Internet Message (ISBN 0-13-092941-7), a book by + Marshall T. Rose. For more details, see support/pop/pop- + more.txt and the Administrator's Guide. The APOP option + peacefully co-exists with the standard POP, KPOP completely + replaces the standard POP, and MPOP requires "bboards: pop". + + File Locking + + 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 mh-tailor(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 + "cp". + + 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 popd will be installed if not + /usr/etc. + + regtest: Set to "on" to prevent the hostname and compile + date from being included in MH binaries. + + sharedlib: You may now specify "sun4" or "sys5" (for SVR4) + shared libraries. + + signal: Specifies the base type of the function returned + by signal(). This was previously defined with + "options TYPESIG". + + Several `-D' options to cc 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 set- + local() function. + + MAILGROUP Makes inc 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 slocal to detect and surpress duplicate + messages. + + OSF1 Support for DEC OSF1 systems. May be incomplete. + + RENAME Include this option if your system has a rename() + system call. + + SVR4 Support for System 5 Release 4 or newer systems. + + TYPESIG This option has been dropped. See `signal' + above. + + UNISTD Include this option if your system has the + include file <unistd.h>. + + VSPRINTF Include this option if your system has the + vsprintf() library routine; otherwise, _doprnt() + will be used. + + YEARMOD Forces the mh-format `year' function to return + 2-digit values. Use this option during a brief + transition period if you have local mh-format + files which need to be converted to support 4- + digit years. + + FUNCTIONAL CHANGES + + 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. + + MH Sequences + + 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. + + Profile Components + + MH 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 inc, etc.) if not + "inbox". + + Format Strings + + A few minor bugs were fixed in format string handling, and a + few new features were added. See mh-format(5) for complete + details. + + Addresses An attempt is made to decipher X.400 + RFC 987-style addresses. + + Comments Comments may be added to mh-format 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 + understand more illegal date formats; `year' + now returns a 4-digit number. + + User Interface Programs + + A number of MH 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 + NULLs. + + folder The `-noprint' option was broken and has been + dropped. + + forw Supports `-mime' to use MIME-style multi-part mes- + sages. + + 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 MH profile (and context) and writes + the values of the specified components on the + standard output; useful in programmatic con- + structs. + + msgchk Supports `-apop' (see above). + + packmbox New; packs an MH folder into a UUCP-style mailbox. + + popi New; a client-side POP initiator; available only + if you built MH 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. + + Support Programs + + fmtdump Can now read a format file, or a format string + given on the command line. + + popauth New; manages the APOP authorization database (see + above). + + sendmail The sendmail replacement will be installed only if + your `mts' setting uses the `/smtp' option. + + slocal A new man page for slocal is available; the new + `mbox' action is available to write a file in + packf 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- + sages. + + viamail New; bundles a directory (like shar) and sends it + through multi-media mail. + + + CHANGES FOR MH 6.7.2 + + The MH.6.7.2 patch release is a maintenance release. This + is the current released version of MH as of February 1, + 1992. + + This release now supports the NCR Tower running SYS5R4. + The WP changes installed in MH.6.7.0 have been removed. + + Shared Libraries + + Support for SYS 5 shared libraries is in progress. + + Support for Sun OS 4.0 shared libraries had been + improved. The MH 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 MH + patch release number, and its numbering begins with version + `1.1' with this release. + + Replacement SendMail + + Since many standard system programs expect to post mail by + invoking /usr/lib/sendmail, a minimal replacement SendMail + 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 post to post mail; be sure you have + configured MH with the `/smtp' mts option. This sendmail + replacement is installed in your MH etc directory, and you + should link /usr/lib/sendmail to it. + + Format Strings + + A manual page for the fmtdump format string disassembler is + supplied, and some new format functions were added: + + folder In scan, this component escape contains the name of + the current folder. It is not defined for other MH + commands. + + getenv This function escape returns the value of an + environment variable. + + There will be some additional changes in these routines + in the next patch release. + + Other Bug Fixes and Enhancements + + 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 + implemented by MH as blind lists. + + date parsing A number of sites have brain-damaged versions + of lex. MH will now come with the date parser + already run through lex. + + mark A bug dealing with mark and the sequence named + `cur' is fixed. This was previously a problem + for mh-e users. + + MH.doc The MH nroff version of the manual no longer + contains teletype escape sequences. + + scan Can now handle headers as long as 512 bytes. + + Signals MH programs will no longer catch the HUP and + TERM signals while waiting for a sub-process. + This was causing hung processes when your + terminal line was was dropped unexpectedly. + + Signature If your signature is not defined, MH 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. + + + CHANGES FOR MH 6.7.1a + + 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. + + Message Sequences + + A new manual page, mh-sequence (5), has been added. This + manual page attempts to completely document the syntax and + semantics of MH 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". + + Format Strings + + MH 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. + + Other Changes + + 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 MH format file, vaguely + reminiscent of assembly language. While this + output format is not explicitly documented, it can + still be useful when debugging MH format files. + + refile Now takes a `-[no]rmmproc' switch. This makes it + easier to avoid loops when your "rmmproc" calls + refile. + + 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 + interrupted. + + whatnow Will now tell you where it is leaving the draft, + when interrupted in the initial edit. Previously + the draft was simply unlinked. + + Compilation Options + + LOCKF This option causes MH to use the lockf() system + call for locking (if available), instead of + flock(). + + + CHANGES FOR MH 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 MH as of December 14, + 1990. + + User-Visible Changes + + The major change in this release is to the POP daemon + (popd). In MH 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 MH 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. + + Internal Changes + + Some bugs were fixed which in general were not user-visible: + + context Errors when writing out sequences are detected + correctly. + + inc No longer inserts extra blank lines into + messages. + + mh-format A nil pointer bug in the address parser was + fixed. + + 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. + + + GENERAL CHANGES FOR MH 6.7.0 + + The author is pleased to announce that there are very few + user-visible changes to MH 6.7 from the previous MH 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. MH 6.7.0 is the current released version + of MH 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. + + User-Visible Changes + + Here a quick summary of the changes that were made which are + not backward-compatible with the previous release of MH: + + repl The `-format' and `-noformat' switches have not been + functional since MH 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 sortm 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". + + + Using Aliases + + A new profile entry `Aliasfile:' has been added. The ali, + send, and whom programs will look for this profile entry and + treat it as they would an argument to `-alias'. This should + make it easier for novice MH users to begin using aliases. + + + Reading Network News & BBoards + + 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, MH 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 MH 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. + + To support the NNTP, a new module, uip/pshsbr.c, is + compiled and loaded into bbc and msh instead of + uip/popsbr.c. The default BBoard is changed from "system" + to "general" for the NNTP. + + When reading BBoards, bbc 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 MH Administrator's Guide for details), or may be speci- + fied on the command line with the `-host' switch. + + + Format Strings + + The manual page mh-format (5) has been rewritten to give a + better explanation of how to write format strings, and how + they are interpreted by MH. A line-by-line description of + the default repl form file (replcomps) is now included in + that manual page. + + Some new format functions were added, and others were + augmented: + + 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 + argument. This could be useful for building + scan 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 + explicit in the date string. + + PROGRAM CHANGES + + 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. + + User Interface Programs + + anno Accepts a `-nodate' switch which inhibits the date + annotation, leaving only the body annotation. + + folder When invoked with the `-pack' switch and the new + `-verbose' switch, folder will give information + about the actions taken to renumber the folder. + + On most systems, folder can now create any + non-existing parent folders of a new sub-folder. + + forw When making digests, forw 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 sortm. + + prompter Considers a period on a line by itself to signify + end-of-file when the `-doteof' switch is speci- + fied. + + repl The `-[no]format' switches have not been used + since MH 5 and have been deleted. repl will now + find filter files in the MH library area. + + scan With the `-file msgbox' switch, scan can list a + packf'd-format file directly (without using msh). + + Lists messages in reverse order with the + `-reverse' switch. This should be considered a + bug. + + sortm Now has the options: `-textfield field', + `-notextfield', `-limit days', and `-nolimit'. + + With these options, sortm can be instructed to + sort a folder based on the contents of an arbi- + trary header such as "subject". + + sortm 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. + + MH Support Programs + + The following support programs also have changes or + enhancements: + + mhl Will now accept a format string on any component, + not just on addresses and dates. + + popd Will use shadow passwords if compiled with the SHA- + DOW option. It can now also read UUCP-style mail- + drops directly. + + rcvtty If given no arguments, rcvtty will produce a scan + listing as specified by a format string or file; a + default format string is used if one is not speci- + fied. + + 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. + + rcvtty will obey terminal write notification set by + mesg. With the `-biff' switch, rcvtty will also + obey the mail notification status set by biff. + + On BSD43 systems, as with write, rcvtty 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, slocal will + strip such lines unless compiled with the RPATHS + option, in which case it will will convert such + lines into "Return-Path:" headers. + + slocal has a new result code "N", for use in .mail- + delivery files. With this result code, slocal 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. + + DOCUMENTATION + + Several of the older MH 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 makewhatis. + + + MH ADMINISTRATION + + This section describes changes in configuring, compiling and + installing MH 6.7 and should not be of interest to casual MH + 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 MH Makefiles have been updated to work around some + incompatibilities introduced in newer versions of make. MH + 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 MH + + + Bug Fixes + + 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 + address 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 + fixed. + + replcomps The "In-Reply-To:" header had quotes added + around the date field to comply with RFC822. + + White Pages + + If MH is compiled with the WP option, send 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, send must be invoked interactively + (i.e., not from push). For each name, send will invoke a + command called fred in a special mode asking to expand the + name. + + To get a copy of the white pages service, contact + wpp-manager@psi.com. + + Configuration Options + + 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 + "nntp". + + bbdelivery Determines whether the bboard delivery agent and + library files should be installed. + + lex To specify an alternate version of lex. + + mailgroup If defined, inc 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 + sprintf (3) library routine returns. + + Compilation Options + + For different configurations, several `-D' options to cc + have been added or changed: + + BERK This disables the address and date parsing rou- + tines. If you want to do much with + mh-format (5), don't enable this. + + BSD43 Will make rcvtty set-group-id to the group + "tty". + + DBM For sites with a dbm-style password file (such + as with Yellow Pages), MH 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 MH not to include the file sys/ioctl.h. + Use this if this file is not present on your + system. + + NTOHLSWAP On systems with TCP/IP networking, msh will try + to use the ntohl() macro from the file + netinet/in.h to byte-swap the binary map files + it writes. + + SENDMAILBUG Some versions of sendmail 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 popd 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 signal system + call. This defaults to "int", but should be + defined as "void" if appropriate for your sys- + tem. + + WP Enables support for the White Pages service. + + Installation + + MH will now explicitly set the protection mode on every file + it installs. + + Previously any existing file installed by MH 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. + ++ +