So we worried a lot about the Y2K bug, but its consequences were limited by awareness and updates. Now that 2010 is here, however, a number of "2010 bugs" have been spotted. Ranging from software problems to credit card glitches, the new year has caused a number of annoyances.
One such problem is on Mac OS X Server, which uses Spam Assassin as its server-side spam filter. It seems that Spam Assassin has problems with the new year, and is classifying some (in many cases most) incoming messages sent following January 1, 2010 as spam. Apple has issued a support document describing this problem, and offering solutions to fix it.