Email is an old system there is no inherent protection or encryption so an intermediary can easily intercept that data and read the contents
"What if the content in the body of the email needs to be protected? Fortunately there are encryption approaches that you can use and there are a couple of choices that you can make depending on what is right for you."
Email Security Part 1: The Basics
Email Security Part 2: Outbound Email
Email Security Part 3: Protecting yourself and your Staff
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