For full details on Greylisting please see Greylisting

General Tab

Greylist quarantine :

The period of time after the first connection during which subsequent connection will be rejected minutes

Greylist timeout :

The period after which unused but validated connections will be purged from the greylist database days

Greylist Zombie timeout :

The period after which connections that have never been validated will be purged from the database

Greylist Entries Tab

Greylist entries

This list shows the connections that are currently in the greylist database

Adding entries

It is possible to use the greylist to always allow or permanently block an IP/Sender/Recipient set by adding them to the list manually.