It is conceivable that spammers will start adding challenge responses to their systems , but this could be countered by making challenges slightly more sophisticated for example , by requiring small human modification to a code 可以想象，垃圾邮件发送者会开始在他们的系统中加一个质询响应，但只要稍微使质询消息变得复杂些，就可以解决这个问题（例如，要求对代码做一点小小的人为改动） 。
In this paper , we design a layered spam filtering system mainly against the ways used by spam senders . the system is highly staged and expansible , including improved distributed black and white list , reverse dns and na ? ve bayes filtering technologies 本论文主要针对垃圾邮件发送者采用的方法,设计出一个层次化的垃圾邮件过滤系统,该系统具有高度的层次化,包括改进型分布式黑白名单,域名反向解析,以及na
Unfortunately , a letter from a stranger - with who - knows - which e - mail application , os , native natural language , and so on , is not immediately obvious in its purpose ; and spammers try to slip their messages underneath such ambiguities 遗憾的是，来自陌生人的电子邮件谁也不知道这些邮件使用的是什么电子邮件应用程序、哪种os以及本地自然语言等不会马上明显地显示出它的目的；垃圾邮件发送者设法在这种含糊状态之下来发送他们的消息。
I do utilize a variety of addresses within the domain i control to detect the source of spam leaks ; but the unfortunate truth is that most spammers get my e - mail address the same way my legitimate correspondents do : from the listing at the top of articles like this , and other public disclosures of my address 利用了多个地址来检测“漏网”垃圾邮件的来源；但不幸的事实是，大多数垃圾邮件发送者可以用与合法邮件发送者相同的方法获取到我的电子邮件地址：象这篇文章一样，从文章的顶部获得地址列表，以及其它有关我地址方面的公开信息。
Mail probes that verify local mail routing by sending a message to a known destination and verifying its delivery , that notify you if the router cannot keep up with mail flow , and that alert you if too much mail is pending to a particular destination or if mail to that destination is failing 邮件探测器，该探测器通过向未知目的地发送消息并验证其传送来验证本地邮件发送，如果路由器不能与邮件流保持一致，探测器会向您发出通知，如果对于某一特定目的地而言，有太多邮件处于待决状态，或者发送到这个目的地的邮件发送失败，那么探测器也会向您发出警告。
