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Anonymity is essential to privacy and free speech.
It can be used to protect whistle blowers, writers of controversial material or even just the ability to write to someone with no forwarding address. Email creates difficulty for anonymity since the sender of a message can be traced back through its paths. Email is not as secure a medium as many people think. Messages can be easily rerouted and read by unintended third parties. Message are also often saved for indefinite amounts of time.