Planning for Messaging Security
Secure messaging in Exchange 2010 can be separated into three levels: network-based, session (or SMTP)–based, and client-based. It is important to understand at what level you want to implement protection. For example, if you implement network- or session-based security, messages are still not encrypted in a user's mailbox. Only client-based security does this. Alternatively you can also consider implementing security at every level, which definitely never can be reached.
Implementing Network-Based Security
Network-based security basically protects the communication on the network layer using protocols such as IPsec or VPN.
IPsec provides a set of extensions to the basic IP protocol and is used to encrypt server-to-server ...
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