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Take Control of Apple Mail in Lion by Joe Kissell

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Sign and Encrypt Messages

Back in Personalize Email with Signatures, I explained how to add a signature—text or graphics to the end of each message with your contact information, a quote, or other content. But a message can also have a digital signature, a (normally invisible) string of characters that confirms to the recipient that the message truly comes from the address it appears to come from, and that the message contents haven’t been altered in transit.

In addition, Mail can encrypt messages, scrambling their contents so that only someone with the necessary key (presumably, the recipient) can view their contents and thereby ensuring private communications.

In this chapter, I discuss if and when you should use digital signatures and encryption, ...

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