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    raise_on_defect     -- If true, then defects should be raised as errors.
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    linesep             -- string containing the value to use as separation
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    cte_type            -- Type of allowed content transfer encodings

                           7bit  -- ASCII only
                           8bit  -- Content-Transfer-Encoding: 8bit is allowed

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    max_line_length     -- maximum length of lines, excluding 'linesep',
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    mangle_from_        -- a flag that, when True escapes From_ lines in the
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