identity
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... domain of the result.
Encoding transformations other than the identity
transformation are usually applied to data in order to
allow it to pass through mail transport mechanisms ...
...
Three transformations are currently defined: identity, the "quoted-
printable" encoding, and the "base64 ...
... Content-Transfer-Encoding values "7bit", "8bit", and "binary" all
mean that the identity (i.e. NO) encoding transformation has been
...