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This form is supported with Postfix versions ≥ 3.0.
The remainder of this document is a description of all Postfix configuration parameters.
The "" is required for "value1", optional for "value2".
This feature requires that the database supports the "delete" and "sequence" operators.
Specify a zero interval to disable database cleanup.
The general format of the file is as follows: The expressions "$name" and "$" are recursively replaced with the value of the named parameter.
The parameter name must contain only characters from the set [a-z A-Z0-9_].This feature is available in Postfix 2.1 and later.