Maybe the wrong thread to discuss this but...
There was something wrong with the formating. It should have been in English, and the HTML-code should have worked.
I had a few users getting different versions of the same mail. Some worked fine, some was strange. You learn as long as you live. It's a bug in phpBB2.0.4.
As soon as phpBB2.2 is released it will be all right again.
Atleast the mail succeded in ONE purpose. We got Dingo back here.