<snip> Interesting is the spelling. It seems to me the author of the spam messages isn't german or of very low education, since his spelling and style is really awful - like a child of 15 years. And the spam sending software doesn't seem to be able to handle german Umlauts (äöüßÄÖÜ). Well, perhaps that is a more generic spam indicator: german text but not a single Umlaut. I must think about that.
Alex </snip> You'd want a length qualifier on that test. An email of simply "Danke" would contain a very small number of umlauts<g>.
