About Mail Areas and Queues

IMSVA stores messages matching specific policy rule actions in the following areas and queues:

Quarantine Area: Stores messages that you would like to analyze before deciding whether to delete or release to the intended recipient(s).
Archive Area: Stores messages for future reference.
Postponed Queue: Stores messages that will be delivered at a specified time.
Deferred Queue: Stores messages that IMSVA is unable to deliver to the next MTA.

There are 4 values to control IMSVA (postfix) retries. For more information, see Deferred Queue Parameters.

So for one deferred mail, the life time is 24 hours, the first retry attempt is after 15 minutes, the second retry is after 30 minutes, and all subsequent retries after 60 minutes. That means there are about 25 retries before the maximal_queue_lifetime value is reached.

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