有关Mdaemon的Dynamic Screening
有时候有人向我反应邮箱被锁住的情况，没有什么规律，如果邮件过大或者pop次数过多都有可能被锁住，过一会儿就好了，其实这是Mdaemon的动态屏蔽功能，关于动态屏蔽Alt-n是这样说的，很遗憾，我发现翻译是门学问，我不知道应该怎么翻译，只能大概看一眼知道是什么意思。
Dynamic Screening
Using the Dynamic Screening features, MDaemon can track the behavior of sending servers to identify suspicious activity and then respond accordingly. For example, with Dynamic Screening you can temporarily ban an IP address from future connections to your server once a specified number of “unknown recipient” errors occur during a mail session with that IP address. You can also ban senders that connect to your server more than a specified number of times in a specified number of minutes, and senders that fail authentication attempts more than a designated number of times.
When a sender is banned, it is not permanent. The sender’s IP address will be banned for the number of minutes that you have specified on this dialog. Further, from the Advanced button on this dialog you can open the DynamicScreen.dat file, which contains a list of the banned IP addresses and the length of time each will be banned. This file is memory resident and can be changed from the Advanced button or manually with a text editor. Note: when editing this file manually you can create a blank file called TARPIT.SEM and place it in MDaemon’s \APP\ directory. This will cause MDaemon to reload the memory resident DynamicScreen.dat file thus implementing your changes.
Via: Mdaemon Doc Table Of Contents Alt-n