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A document delivered directly by mail from the source is much less apt to be substituted with a forged document containing a preferred message than one hand carried by the trusted and hand picked minion of a person with an overwhelming vested interest the the delivery of a document saying exactly what the minion's hand picker wants it to say.

They don't call it the man-in-the-middle attack for nothing.

[Gene Eric]

>> They don’t call it the man-in-the-middle attack for nothing.

Man-in-the-middle intercepts without the knowledge of either party.