Delivery mode

Controls when messages send to this mail server are delivered. Possible options are :

  • Background
    Messages are delivered as soon as possible in the background.
  • Queue only
    Submitted messages are merely placed in the queue, and not delivered until the queue is flushed manually.
  • Interactive
    Messages are delivered immediately.
  • Deferred
    Like Queue only, but no DNS or NIS lookups are done for submitted messages.

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