Hi PRust,
Symantec Messaging Gateway (formerly Symantec Brightmail Message Filter) includes the following key components / features:
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Targeted attack, malware, and zero-day threat protection.
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Provides effective, real-time protection against new and emerging threats before they cause disruptions.
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Anti-spam filter blocks more than 99% of spam with less than one in 1 million false positives and real-time automatic updates.
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Strong data loss prevention capabilities ensure customers stay in regulatory compliance.
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Customer- Specific Rules allow customers to easily create rules based on email they consider to be spam or on potentially targeted attacks.
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Optional encryption integration with Symantec Content Encryption or Symantec Gateway Email Encryption.
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Includes a dashboard, summary reports, and detailed reports demonstrating the efficacy and impact of Messaging Gateway while proactively highlighting threat trends and potential compliance issues.
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Flexible, configurable, easy-to-use Messaging Gateway virtual edition runs on VMware or Microsoft hypervisors in the hardware environment of the customer’s choosing.
Please visit the solution page for further info: http://www.symantec.com/messaging-gateway/
SMG is licensed on a per-user/per-year subscription model. The same license is valid for both the virtual edition and the standard appliance software. Customers purchase a subscription based on the relevant buying program, the number of employees they want to protect and the number of years they would like to be protected.
So if you have 5000 users, you would need a license for 5000 users on a 12/24/36 month subscription model.
I hope this helps.
Regards,
Anthony