You obviously cannot get rid of the Edge Server role, the SMG operates as an extension to your exchange environment. The SMG is typically placed as the smarthost by the edge server for outbound email, and is where inbound mail comes from as well. Kinda like:
Internal Exchange Roles <--> Edge Transport <--> SMG <--> Internets
As you're new to the product, the below article may be of use:
Symantec Messaging Gateway (SMG) - Best Practices: New Deployments.
Article:TECH122730 |
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Created: 2010-01-26 |
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Updated: 2012-08-15 |
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Article URL http://www.symantec.com/docs/TECH122730
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Don' forget, there's also the below product, which can be directly installed onto your Exchange Servers (the same way that Forefront sits on Exchange).
http://www.symantec.com/mail-security-for-microsoft-exchange