instance method parse

# File actionmailer/lib/action_mailer/vendor/tmail-1.2.7/tmail/header.rb, line 219
    def parse
      save = nil

      begin
        parse_init
        do_parse
      rescue SyntaxError
        if not save and mime_encoded? @body
          save = @body
          @body = Decoder.decode(save)
          retry
        elsif save
          @body = save
        end

        @illegal = true
        raise if @config.strict_parse?
      end
    end