Good infrastructure security relies on a layered approach, much like an onion. A good security policy must assume eventual failure of one or more security devices or policies, and therefore will create multiple security compartments. The final layer of security must be designed to protect specific assets, separate of any other layers, and limit the overall damage any one intrusion may cause. In this paper I will address several security policies that concern the secure transmission of email between client(s) and server(s) and transmission between one or more servers. Separate email security issues such as non-repudiation, digital signatures, encryption, intrusion detection, host-firewalls, server security and client security have been successfully addressed in depth by other publications.
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