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The time after which a failed probe expires from the address verification cache.
Default values are shown after the parameter name in parentheses, and can be looked up with the "postconf -d" command.
Note: this is not an invitation to make changes to Postfix configuration parameters.
As a migration aid, an attempt to open the file under a non-Postfix directory is redirected to the Postfix-owned data_directory, and a warning is logged.
Examples: Enable caching of failed address verification probe results.
If the database becomes corrupted, the world comes to an end.
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_].
Specify a location in a file system that will not fill up.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".When this feature is enabled, the cache may pollute quickly with garbage.When this feature is disabled, Postfix will generate an address probe for every lookup.This feature is available in Postfix 2.1 and later.