# File lib/mail/message.rb, line 1635
    def decode_body
      if Mail::Encodings.defined?(content_transfer_encoding)
        Mail::Encodings.get_encoding(content_transfer_encoding).decode(body.encoded)
      else
        raise UnknownEncodingType, "Don't know how to decode #{content_transfer_encoding}, please call #encoded and decode it yourself."
      end
    end