Symantec 10765539 - Mail Security For SMTP, Руководство по планированию

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22 Planning your deployment
Deployment models
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Compared with basic gateway deployment, this configuration eliminates a
single point of failure for message scanning.
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This model allows administrators to take individual Scanners offline for
maintenance without incurring downtime.
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This scenario enables load balancing of filtered mail across multiple
downstream MTAs.
Considerations
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This approach requires more administrative overhead and complex
networking than a basic gateway deployment.
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With increased hardware and maintenance costs, this model could require a
higher total cost of operation.