3 umpf \- universal mail processing filter
6 [-c config_file] [-m default_mailbox]
8 Umpf is a program that reads an e-mail from stdin and according to the config
9 file decides, what to do with it. It is possible to forward the e-mail,
10 filter it through external program and, of course, deliver it to the local
11 mailbox. IMAP support is planned, but not ready yet.
15 Set an alternative location of the config file.
18 Set an alternative location of the default mailbox.
20 The program reads a config file (default location is
23 to the rules provided it decides, what to do with it. If no rule is matched,
24 or some action fails, or the config file cannot be parsed, e-mail is
25 delivered to the default mailbox (default location is
27 , program needs setgid to be able to use it).
29 Variables can be specified in the config file. Their identifiers must start
32 , variables have three types that are distinguisghed according to the case of
33 the identifiers. Upper case identifiers are reserved for automatic variables
34 like message size, it is possible to modify them but it is not encouraged.
35 Variables with identifiers starting with an upper-case letter but mixed case
36 otherwise correspond to values of e-mail headers, assigning to them will
37 change the headers. Variables with identifiers starting with a lower case
38 letter are intended for general use. Otherwise, variable identifiers are
39 case-insensitive, ie. $abc refers to the same variable as $aBc, but not the
40 same as $Abc and all of these variables differ from $ABC.
41 .SS AUTOMATIC VARIABLES
42 Config file recognizes these automatic variables:
45 refers to the length of the e-mail, including headers
48 refers to the exit code of last external program executed (actions filter or
49 pipe can be used to do it)
52 refers to the output of last external program executed by action pipe
54 A command is either an action specification or an assignment. All the
55 commands must with semicolon. Commands can be grouped in blocks bounded by
58 Assignment is specified in a following way:
62 Lvalue is a variable identifier. Rvalue can be variable, a constant (constant
63 must be given in double quotes) or an expression consisting of variables,
64 constants and binary operations
76 stands for string contatenations, the rest of them are arithmetic operations.
77 Doing arithemtic operations makes sense only on integers. Precedence of the
78 operations can be specified using parentheses.
80 Actions are specified with an arrow operator. Plain
83 means "deliver the e-mail to the default mailbox and exit".
86 means "deliver the e-mail the mailbox specified behind arrow and exit"
88 .B -> pipe expression ;
89 means "pipe the e-mail to the external program specified behind pipe
90 keyword". Output of the program is stored in
92 variable, its exit code is stored in
96 .B -> filter expression
97 means "pipe the e-mail to the external program and replace it with output of the program". All the headers variables,
104 means just "discard the email and exit".
106 .B -> mail expression ;
107 means "forward the e-mail to the address specifed behind the mail keyword and exit"
109 If action fails, the e-mail is delivered to the default mailbox.
111 Some of the actions (delivery or forwarding an e-mail) can have keyword copy
112 in front of the arrow, ie.
114 .B copy -> "mailbox";
116 When copy is specified, the program does not exit after doing an action but
117 continues reading the rules. It also does not deliver to default mailbox if
120 Conditional execution of commands can be specified in a following way:
122 .B if (condition) { ... }
124 .B if (condtion) { ... } else { ... }
126 .B if (condition) { ... } else if { ... } [ else { ... } ]
128 where the condition can be a constant, a variable or an expression consisting
129 of following operations:
132 is binary boolean and
138 is binary boolean xor
143 A variable or a constant has a boolean value 0, if its value is either "" or
146 Expressions can be compared using following binary relations.
152 means "matches" (left operand should be string, right one can be a perl compatible regular expression)
155 means "does not match"
157 Integer comparisons (does not make sense on strings):
163 means "is not equal to"
166 means "is lesser than"
169 means "is greater than"
172 means "is lesser or equal than"
175 means "is greater or equal than"
177 Parentheses can be used to specify a precedence. Boolean operations have greater priority than relation operations.
179 All the text behind a hash character up to the end of the line is ignored.
195 Anicka <anicka@anicka.net>
197 Current version of the program can be downloaded at
198 .B http://www.anicka.net/umpf
200 The program can be used according to the terms of GPL, version 2.