Maximum number of unconfirmed messages, that this actor is allowed to hold in the memory. When this number is exceed, Deliver(ActorPath, FuncInt64, Object, Boolean) will throw MaxUnconfirmedMessagesExceededException instead of accepting messages.

Interval between redelivery attempts.

Maximum number of unconfirmed messages that will be sent at each redelivery burst. This is to help to prevent overflowing amount of messages to be sent at once, for eg. when destination cannot be reached for a long time.

After this number of delivery attempts a UnconfirmedWarning message will be sent to Self. The count is reset after restart.