So, phpBB3 out of the box is pretty impressive in many respects, including it's prevention measures for spam. However, it was recently tumbled by the highly enthusiastic band of Internets™ spammers whose determination to rubbish boards is only exceeded by their lack of self-control.
So, straightaway, it seemed necessary to introduce an anomaly in the board code to trip up the brutes. The upshot is that people who post here anonymously will be required to include a special symbol in the confirmation code field. Further details are provided at the appropriate juncture (in English only).
It is, in fact, an experiment to see how well people are able to follow directions. "Hors d'oeuvres, which must be obeyed at all times!"