74 lines
2.0 KiB
Prolog
74 lines
2.0 KiB
Prolog
<!doctype html public "-//W3C//DTD HTML 4.01 Transitional//EN"
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"http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<head>
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<title>Postfix Configuration Parameters </title>
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<meta http-equiv="Content-Type" content="text/html; charset=us-ascii">
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</head>
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<body>
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<h1><img src="postfix-logo.jpg" width="203" height="98" alt="">Postfix Configuration Parameters </h1>
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<hr>
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<h2> Postfix main.cf file format </h2>
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<p> The Postfix main.cf configuration file specifies a very small
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subset of all the parameters that control the operation of the
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Postfix mail system. Parameters not explicitly specified are left
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at their default values. </p>
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<p> The general format of the main.cf file is as follows: </p>
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<ul>
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<li> <p> Each logical line is in the form "parameter = value".
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Whitespace around the "=" is ignored, as is whitespace at the end
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of a logical line. </p>
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<li> <p> Empty lines and whitespace-only lines are ignored, as are
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lines whose first non-whitespace character is a `#'. </p>
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<li> <p> A logical line starts with non-whitespace text. A line
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that starts with whitespace continues a logical line. </p>
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<li> <p> A parameter value may refer to other parameters. </p>
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<ul>
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<li> <p> The expressions "$name", "${name}" or "$(name)" are
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recursively replaced by the value of the named parameter. </p>
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<li> <p> The expression "${name?value}" expands to "value" when
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"$name" is non-empty. </p>
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<li> <p> The expression "${name:value}" expands to "value" when
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"$name" is empty. </p>
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</ul>
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<li> <p> When the same parameter is defined multiple times, only
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the last instance is remembered. </p>
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<li> <p> Otherwise, the order of main.cf parameter definitions does
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not matter. </p>
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</ul>
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<p> The remainder of this document is a description of all Postfix
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configuration parameters. Default values are shown after the
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parameter name in parentheses, and can be looked up with the
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<b>postconf -d</b> command. </p>
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<p> Note: this is not an invitation to make changes to Postfix
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configuration parameters. Unnecessary changes are likely to impair
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the operation of the mail system. </p>
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<dl>
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