recent years have seen the appearance of some internet services which automatically perform this challengeresponse function for the user and require the sender of an e-mail to visit their web site to facilitate the receipt of their message
近年来出现了一些互联网服务，这些服务自动为用户执行这种挑战响应功能，并要求电子邮件的发件人访问他们的网站以方便接收他们的信息
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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