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Reorganized the content in the Intro and added placeholders for missing parts.
author markus schnalke <meillo@marmaro.de>
date Tue, 08 May 2012 18:37:12 +0200
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children 6c63083b4c19
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1 .H0 "Introduction
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2 .P
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3 This chapter describes the background of the topics in this thesis.
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4 General knowledge of electronic mail is assumed.
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5 It explains the situation at the start of the project.
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6 It tries to describe from what state the project lifted of and where
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7 it headed to. This shall give an overview.
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10 .H1 "Email Prerequisites
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11 .P
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12 XXX Do we really need that?
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15 .H1 "What is MH?
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16 .P
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17 MH is an electronic mail system, originating in the RAND Corporation.
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18 Historically, it had been a all-in-one mail system, with both Mail Transfer
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19 Agent (MTA) and Mail User Agent (MUA).
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20 Later, when email setups changed, Mail Submission Agent (MSA)
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21 and Mail Retrieval Agent (MRA) facilities were added.
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22 The MTA became less important, whereas the MUA became even more the
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23 central part.
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24 .P
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25 MH defines a mail handling concept.
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26 It had started as a design proposal, not as an implementation, and
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27 in spirit had remained this way. This is similar to Unix, which
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28 rather is a style of system design than specific software product.
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29 .P
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30 XXX Link to the Unix phil.
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31 .P
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32 XXX comparision to monolithic mail systems.
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33 .P
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34 XXX Differenciation of MUA and mail system.
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35
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36 .U2 "History
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37 .P
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38 MH is an electronic mail system, originating in the RAND Corporation.
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39 In 1977, Norman Shapiro and Stockton Gaines had proposed the design
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40 of a new mail handling system, called ``Mail Handler'' (MH) for RAND,
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41 to superseed their ``Mail System'' (MS).
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42 Two years later, in 1979, Bruce Borden took the proposal and implemented a
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43 prototype of MH. It proved successful and replaced MS thereafter.
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44 .P
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45 A decade later, the University of California had started to use MH.
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46 They also took over its development and pushed MH forward.
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47 This had been the time when the Internet appeared, Berkeley implemented
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48 the TCP stack, and Sendmail was born. MH had often contained the first
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49 implementation of new RFCs.
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50 .P
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51 In the nineties, MH had been moved into the public domain, making it
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52 attractive to Free Software developers. The Internet had started to become
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53 mainstream and in 1997, Richard Coleman initiated the ``New Mail Handler''
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54 (nmh), a fork of MH. He intended to modernize MH, improve its MIME
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55 capabilities, and this should be done openly within the Internet
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56 community. Today, nmh almost completely replaced the original MH.
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58 .U2 "Concepts
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59 .P
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60 MH is a toolchest, modelled after the Unix toolchest. It consists of a
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61 bunch of tools, each covering one task of email handling. These programs
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62 operate on a common mail storage. The specific format of the mail storage
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63 also defines MH, like the file system structure defines Unix. It
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64 consists of directories (mail folders) and files (mail messages).
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65 Each file contains exactly one message in the format it had been
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66 received (i.e. transfer format). MH tools carry a state (context),
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67 consisting of current mail folder and current message. Messages can
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68 have symbolic names, like the next or last message or for some
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69 arbitrary group of messages. These names are called sequences.
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70 .P
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71 New MH tools can be build out of existing ones easily. Default values to
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72 commands are stored on a command name-basis, making it trivial to have
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73 different versions of the same command with different defaults. Most
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74 of the configuration is stored in the user's profile. Form templates,
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75 e.g. for new messages or replies, are exchangeable and output is generally
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76 adjustable with format files.
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77 .P
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78 MH allows the user to automate almost everything and to modify amost
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79 any behavior. The system is scriptable and extendable.
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80
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81 .U2 "Available Versions
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82 .P
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83 Three versions of MH are available today:
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84 .BU
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85 .I "Original MH" .
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86 In most cases it has been replaced by nmh, but some systems still
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87 provide old MH. As nmh is old MH-compatible, there exist few reasons
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88 not to upgrade to new.
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89 The development of old MH has stopped after the 6.8.4 release in
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90 February 1996.
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91 .BU
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92 .I nmh .
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93 The most widespread version of MH was forked off version 6.8.3 in December
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94 1996. It incorporated the \fILBL changes\fP.
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95 It provides backward-compatible to old MH by having new featues deactivated
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96 by default. To use them, the user needs to activate them explicitely.
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97 Its development went slowly in the previous years, but had revived
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98 in December 2011.
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99 .BU
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100 .I mmh .
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101 This version is the subject of this thesis.
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102 It is a descendent of nmh. It had started as a non-compatible experimental
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103 version, but became de facto a fork. It tries to expand the same
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104 principle concepts in a more modern way.
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105
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106 .U2 "Example Session
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107 .P
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108 Example mail handling session with mmh, but mostly compatible with nmh
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109 and old MH. The look'n'feel is common among them.
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110
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111
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112 .H1 "Understanding the Code and Community
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113 .P
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114 In order to understand the state, goals and dynamics of a project,
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115 one needs to know its history. MH comes from a time before the
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116 Internet, a time before networking became universal, a time when
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117 emailing was small, short and simple. Then it grew, spread and
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118 adopted to the changes. The core-concepts, however, remained the
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119 same. During the XXX a small group of students at the University of
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120 California, actively worked on MH. They added features and optimized,
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121 like it is common for scientific work. This is still in pre-ANSI C
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122 times. The source code contains many ancient parts. Code constructs
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123 specific to BSD or hardware of that time are usual.
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124 .P
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125 Nmh started eight years after the ANSI C standard had been
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126 established. A more modern coding style entered the code base. Still
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127 a part of the developers come from ``the old days''. The developer
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128 base became more diverse and thus the code. Programming practices
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129 from different decades merged into the project. Different coding
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130 styles came together. It appears as if multiple peers added code
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131 parts, resulting in a conclomeration rather than an homogenic
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132 of-one-cast mail system. Still, the basic concepts hold it together.
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133 They were mostly untouched throughout the years.
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134 .P
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135 Although, at the surface, nmh is a toolchest, meaning a collection
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136 of completely modularized small programs, on the source code level,
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137 it is much more interweaved. Parts of the basic functions are
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138 collected in a MH standard library, which is good, but often
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139 separate functions are compiled into programs, for effiency reasons.
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140 This lead to intricate innards.
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141 The advent of MIME rose the complexity of email by a magnitude. This
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142 is visible in nmh. The MIME-related parts are the most complex ones.
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143 It's also visible that MIME support had been added on top of the
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144 original MH later. The MH style made this easily possible, but it
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145 also lead to duplicated functions (e.g. \fLshow\fP, \fLmhshow\fP)
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146 and had not been thoroughly included into the concepts (e.g. the
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147 user-visible access to whole messages and MIME parts are inherently
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148 different).
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149 .P
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150 For compatibility's sake, it is a common understanding to have the
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151 default settings to be compatible, requiring any new feature to be
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152 explicitely enabled. This puts a burden on new users, because nmh
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153 out-of-the-box keeps staying in the same ancient style, where users
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154 usually want to have it practical for modern emailing.
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155 But of course, this depends on if nmh is seen to be a front-end or a
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156 back-end.
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157
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158
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159 .H1 "mmh
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160
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161 .U2 "Motivation
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162 .P
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163 XXX
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164
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165 .U2 "Why it is worth it
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166 .P
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167 XXX
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168
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169 .U2 "Target Field
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170 .P
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171 XXX Target field and scenarios
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172 .P
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173 The target user in mind likes Unix and its philosophy.
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174 He likes to use programs that are conceptionally appealing.
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175 He's familiar with the command line and enjoys its power.
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176 He is at least capable of shell scripting and wants to improve his
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177 productivity by scripting the mail system.
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178 His computer and operating system are from post-ANSI C times.
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179 He likes to attach files, exchanges text containing non-ASCII
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180 characters, signs or encrypts his messages.
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181 He does not use bulletin boards anymore, nor non-mbox style mail
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182 drops, nor does he rely on compatibility to nmh.
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183 He already has and MTA/MSA and MRA running or is able to set them
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184 up.
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185 He does not want to have to read a book in order to make his MUA
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186 usable.
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187 .P
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188 XXX Limitations
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189
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190 .U2 "The Vision
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191 .P
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192 The general goals of the mmh project are the following:
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193 .BU
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194 I believe that mmh should be perfectly suited for modern emailing,
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195 out-of-the-box.
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196 .BU
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197 I care less about compatibility and more about conceptionally elegant
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198 approaches.
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199 .BU
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200 I care for general, clear, and simple concepts.
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201 .BU
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202 I like to create an of-one-style email system. It should feel like
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203 cast as one.
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204 .BU
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205 I plan to remove any optimizations that rises obscurity, unless it
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206 appears to be neccessary to make mmh usable at all.
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207
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208 .U2 "Work to do
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209 .BU
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210 Remove the MTA and MRA facilities. Mmh shall concentrate on the MUA
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211 task. Mail shall enter mmh's mail storage via the system mail drop
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212 and it shall leave mmh via the local \fLsendmail\fP command.
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213 .BU
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214 Remove any further functions that are not related to mmh's main task.
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215 Bulletin board support is on example. Also remove support for ancient
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216 technologies, like hardcopy terminals.
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217 .BU
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218 Refactor the source code to meet modern style criteria. Use
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219 standardized library functions when possible.
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220 .BU
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221 Replace performance optimizations by clear and readable code.
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222 .BU
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223 Reduce the feature set to the commonly used one, removing
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224 corner-cases. Set sane default values.
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225 .BU
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226 Add better attachment support. Add support for digital signatures and
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227 encryption.
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228 .BU
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229 Merge \fLshow\fP and \fLmhshow\fP into one single mail display program.
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230 Integrate MIME support deeper and more natural into MH.
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231 .BU
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232 Provide a ready-to-use setup out-of-the-box.
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233
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234
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235 .H1 "Goals of this Thesis
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236
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237 .U2 "Methods
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238 .P
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239 foo