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diff --git a/proto/postconf.html.prolog b/proto/postconf.html.prolog new file mode 100644 index 0000000..a7d41ee --- /dev/null +++ b/proto/postconf.html.prolog @@ -0,0 +1,105 @@ +<!doctype html public "-//W3C//DTD HTML 4.01 Transitional//EN" + "http://www.w3.org/TR/html4/loose.dtd"> + +<html> + +<head> + +<title>Postfix Configuration Parameters </title> + +<meta http-equiv="Content-Type" content="text/html; charset=us-ascii"> + +</head> + +<body> + +<h1><img src="postfix-logo.jpg" width="203" height="98" alt="">Postfix Configuration Parameters </h1> + +<hr> + +<h2> Postfix main.cf file format </h2> + +<p> The Postfix main.cf configuration file specifies a very small +subset of all the parameters that control the operation of the +Postfix mail system. Parameters not explicitly specified are left +at their default values. </p> + +<p> The general format of the main.cf file is as follows: </p> + +<ul> + +<li> <p> Each logical line is in the form "parameter = value". +Whitespace around the "=" is ignored, as is whitespace at the end +of a logical line. </p> + +<li> <p> Empty lines and whitespace-only lines are ignored, as are +lines whose first non-whitespace character is a `#'. </p> + +<li> <p> A logical line starts with non-whitespace text. A line +that starts with whitespace continues a logical line. </p> + +<li> <p> A parameter value may refer to other parameters. </p> + +<ul> + +<li> <p> The expressions "$name" and "${name}" are recursively +replaced with the value of the named parameter. The parameter name +must contain only characters from the set [a-zA-Z0-9_]. +An undefined parameter value is replaced with the empty value. </p> + +<li> <p> The expressions "${name?value}" and "${name?{value}}" are +replaced with "value" when "$name" is non-empty. The parameter name +must contain only characters from the set [a-zA-Z0-9_]. These forms are +supported with Postfix versions ≥ 2.2 and ≥ 3.0, respectively. +</p> + +<li> <p> The expressions "${name:value}" and "${name:{value}}" are +replaced with "value" when "$name" is empty. The parameter name must +contain only characters from the set [a-zA-Z0-9_]. These forms are +supported with Postfix versions ≥ 2.2 and ≥ 3.0, respectively. +</p> + +<li> <p> The expression "${name?{value1}:{value2}}" is replaced +with "value1" when "$name" is non-empty, and with "value2" when +"$name" is empty. The "{}" is required for "value1", optional for +"value2". The parameter name must contain only characters from the +set [a-zA-Z0-9_]. This form is supported with Postfix versions +≥ 3.0. </p> + +<li> <p> The first item inside "${...}" may be a relational expression +of the form: "{value3} == {value4}". Besides the "==" (equality) +operator Postfix supports "!=" (inequality), "<", "≤", "≥", +and ">". The comparison is numerical when both operands are all +digits, otherwise the comparison is lexicographical. These forms +are supported with Postfix versions ≥ 3.0. </p> + +<li> <p> Each "value" is subject to recursive named parameter and +relational expression evaluation, except where noted. </p> + +<li> <p> Whitespace before or after each "{value}" is ignored. </p> + +<li> <p> Specify "$$" to produce a single "$" character. </p> + +<li> <p> The legacy form "$(...)" is equivalent to the preferred +form "${...}". </p> + +</ul> + +<li> <p> When the same parameter is defined multiple times, only +the last instance is remembered. </p> + +<li> <p> Otherwise, the order of main.cf parameter definitions does +not matter. </p> + +</ul> + +<p> The remainder of this document is a description of all Postfix +configuration parameters. Default values are shown after the +parameter name in parentheses, and can be looked up with the +"<b>postconf -d</b>" command. </p> + +<p> Note: this is not an invitation to make changes to Postfix +configuration parameters. Unnecessary changes are likely to impair +the operation of the mail system. </p> + +<dl> |