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- sent as postcard
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## internal states
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### security
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* Letter
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- we have a key for every recipient and no downgrade is enforced
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* Postcard
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- to everyone
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- we have no key for every recipient
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- downgraded letter (could be the letter, but the user wants to send a letter)
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- some recipients will get a "secure" mail, because we have a key of them
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- partial encrypted mail (parts of the message are encrypted)
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- censored mail (not invertible destruction of text parts)
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### other
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