Rejecting supposed spam at SMTP time is somewhat controversial (withthe risk being that you will reject legitimate email). What is lessappreciated is that not rejecting spam at SMTP time is also dangerous;it just has different and less obvious risks.

The problem is that if you do not reject spam you will wind up filteringspam, and the consequences of mis-characterizing legitimate email asspam are much worse if you filter than if you reject. If you rejectoutright, the sender of such email knows that it didn

Being written in Python, DWiki uses a certain amount of object orienteddesign (not huge amounts; it has basically no inheritance hierarchyamong its classes, although they have various interrelations). Inparticular, it has a Page class that represents a particular real pageat the model level (not the presentation level, which is where templateprocessing and so on happens).

Here is a trick question: is a page's URL a property of the page?(That is, should the Page class have a url

Following up yesterday's entry on the general background of system virtual memory limits, here's howLinux deals with this issue. In its traditional way, Linux gives youthree options for what happens when a process tries to allocate somemore memory, controlled by the value of the vm.overcommit_memory sysctl:

• the kernel gives you the memory unless it thinks you would clearlyovercommit the system (mode 0, the default, 'heuristic overcommit').

• the kernel always gives you the memory (mode 1