`advfilter`: `<boolean>` ('default =' `1`)::
-Use advanced filters for statistic.
+Enable advanced filters for statistic.
++
+If this is enabled, the receiver statistic are limited to active ones
+(receivers which also sent out mail in the 90 days before), and the contact
+statistic will not contain these active receivers.
`avast`: `<boolean>` ('default =' `0`)::