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When scientists "invented" electronic mail 30 years ago, they had in mind the exchange of messages between a small number of computers in few universities. Because they worked within a closed network nobody was concerned about misuse.
Today everything changed: Internet became an open network and the e-mail protocol SMTP is used to send billions of messages. Among them a lot with sensitive, private or valuable information. Unfortunately the e-mail protocol is still lacking inherent security and thus it is imperative:As an e-mail receiver without additional security functions you can not trust neither the e-mail sender nor its content!