白名单则相反——它们包含您期望接收邮件的地址列表，可用它过滤来自其他资源的消息。
Whitelists do the reverse — they contain a list of addresses from which you expect to receive mail and filter messages received from other sources.
甚至更好的是，通过使用脚本对其中的信息进行解析，并将邮件消息移动到一个更合适的结构中，您可以对邮箱的内容进行重新过滤。
Even better, you can re-filter the contents of the mailbox by parsing the information with a script and moving mail messages into a more suitable structure.
这个程序可以执行所需的qmail-queue，这可能会有用，来过滤哪些包含病毒的邮件消息。
This program can then execute qmail-queue as necessary, which might be useful, for example, to filter out email messages that contain viruses.
虽然我没有用过这些工具，而只是自己做了些实验，但我认为，“白名单”／验证过滤器几乎可以 100% 地将垃圾邮件消息阻挡在外面。
Although I have not used any of these tools more than experimentally myself, I would expect whitelist/verification filters to be very nearly 100% effective in blocking spam messages.
如果消息分数超过某一特定的阈值，则将其视为垃圾邮件而过滤它；否则认为是合法。
If a message's score exceeds a certain threshold, it is filtered as spam; otherwise it is considered legitimate.
当MTA收到一条消息时，会调用分布式黑名单过滤器来确定这条消息是否是已知的垃圾邮件。
When a message is received by an MTA, a distributed blacklist filter is called to determine whether the message is a known spam.
大多数过滤软件能让您将受拒的消息保存在临时文件夹中，等待您去查看—但如果需要查看的文件夹中充斥着大量的垃圾邮件，那么这个软件的实用性会因此而削弱。
Most filtering software allows you to save rejected messages in temporary folders pending review — but if you need to review a folder full of spam, the usefulness of the software is thereby reduced.
email客户端可以过滤机器人和垃圾邮件，而区分来自真人的私人消息和一般消息则没那么容易。
While email clients can filter bot and spam messages, it's more difficult to discern between personal and general messages from real people.
然而，在缺少预先过滤的情况下，每个垃圾邮件的接收者必须按自己的“Delete”按钮来删除垃圾消息。
Each recipient of a spam, however, in the absence of prior filtering, must press his own "Delete" button to get rid of the message.
在垃圾邮件过滤器中的“误否认”(Falsenegatives)仅意味着一些不需要的消息进入了邮箱。
False negatives in spam filters just mean that some unwanted messages make it to your inbox.
集合4：查找那些在邮件头中具有合法地址，但通过上一个To：过滤器没有捕获到的消息。
Set 4: Look for messages that have a legit address in the header, but that weren't caught by the previous To: filters.
我们谈论一个垃圾邮件过滤器“高了”，这意味着它捕获了太多的消息。
We talk about a spam filter being "high," that means it's trapping too many messages.
我们谈论一个垃圾邮件过滤器“高了”，这意味着它捕获了太多的消息。
We talk about a spam filter being "high," that means it's trapping too many messages.
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