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No hardware or software required.
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No upgrade costs.
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No installation or maintenance hassles.
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Only a simple DNS/MX change to enable.
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No staff training is required.
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Quicker to implement than a software solution.
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Keeps Spam and viruses away from the corporate network.
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Reduces network bandwidth and storage.
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Safely queues email if your server is down.
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Platform independent.
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Prevents email borne denial of service attacks.