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* The queue manager (the qmgr(8) server process in the figure) is the heart
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of Postfix mail delivery. It contacts the smtp(8), lmtp(8), local(8),
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virtual(8), pipe(8), or error(8) delivery agents, and sends a delivery
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virtual(8), pipe(8), discard(8) or error(8) delivery agents, and sends a
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The queue manager maintains a small active queue with the messages that it
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has opened for delivery. The active queue acts as a limited window on