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can then be manipulated and turned over to a Generator to return the
textual representation of the message.
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continuation lines, optionally preceeded by a `Unix-from' header. The
header block is terminated either by the end of the string or by a
blank line.
_class is the class to instantiate for new message objects when they
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zero arguments. Default is Message.Message.
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aspects of the parser's operation. The default policy maintains
backward compatibility.
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