Struct.new(:media_type, :subtype, :param, :content_id, :description, :encoding, :size, :envelope, :body, :lines, :md5, :disposition, :language, :extension)
Net::IMAP::BodyTypeMessage represents MESSAGE/RFC822 body structures of messages.
Returns a Net::IMAP::Envelope giving the envelope structure.
Returns an object giving the body structure.
And Net::IMAP::BodyTypeMessage has all methods of Net::IMAP::BodyTypeText.