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Standard configuration options under spellchecking allows user to toggle auto-spellcheck
before queueing and sending e-mail.
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The message is composed and user selects PGP sign. Passphrase challenge is presented.
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Eudora invokes PGP and signs message, then initiates spellcheck. One word is
changed to demonstrate.
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Eudora then even attempts to "correct" the PGP signature itself!
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Even long strings are not immune to this "correction."
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End result: because the content of the signed message was altered by the spellchecker following
original generation of the PGP signature, the message now has a "Bad Signature."
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