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textual representation of the message.
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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
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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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