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These forms are supported with Postfix versions ≥ 2.2 and ≥ 3.0, respectively.
The expressions "$" and "$" are replaced with "value" when "$name" is empty.
Unnecessary changes are likely to impair the operation of the mail system.
The numerical Postfix SMTP server response code for an access(5) map "defer" action, including "defer_if_permit" or "defer_if_reject".
This feature is available in Postfix 2.6 and later.
When this feature is disabled, Postfix will generate an address probe for every lookup.
This is the default with Postfix version 2.6 and earlier.
Specify a location in a file system that will not fill up.
The general format of the file is as follows: The expressions "$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_].