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The amount of time between verify(8) address verification database cleanup runs.
This feature requires that the database supports the "delete" and "sequence" operators.
This feature is available in Postfix 2.6 and later.
Examples: Enable caching of failed address verification probe results.
When this feature is enabled, the cache may pollute quickly with garbage.
Specify a zero interval to disable database cleanup.
After each database cleanup run, the verify(8) daemon logs the number of entries that were retained and dropped.
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The table is maintained by the verify(8) service, and is opened before the process releases privileges.