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continuation lines, optionally preceded 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
must be created. This class must have a constructor that can take
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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continuation lines, optionally preceded by a `Unix-from' header. The
header block is terminated either by the end of the input or by a
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