Thank you very much. I looked into it, but when I got it right, it must work with $_POST.
I tried that first (3 days ago) nad it did not work.
$_POST['your-code']
Now, I uninstalled CF7 and every plug-in (what I also tried before), I updated to php 5.6 (this was new) and installed CF7 again – and what should I say, it works like expected.
Sometimes, it is weird.
TY