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.
This feature is available in Postfix 2.6 and later.
The amount of time between verify(8) address verification database cleanup runs.
The lookup table is persistent by default (Postfix 2.7 and later).