optimierung - 2:15 pm on Jan 12, 2013 (gmt 0)
You can ignore these 404 errors but to eliminate them check the following:
We had the same problems for a lot of our domains presumably created by the same website. After invoking a procedure offered by this site we could remove our domains in their data base and the 404 errors created by this site no longer appeared (a site verification procedure is necessary).
Hope this helps