@Knubbi I can't believe anyone is still considering 1&1 as a viable hosting option for... anything really.
According to this, you should be able to do so.
And according to this, you should grab your things and run for the hills.
I can't recommend any hoster in Germany (I live in Switzerland, and all clients insist on a .ch hosting company), but I'm sure you'll find something more professional, serious and stable than what you currently have. In the long run, the extra bucks you spend will be money well-spent. (but of course, there are black sheep everywhere in the industry, not just in the lower-price area)