Yes, i saw all the questions about the weird characters at the end of a PHP script. I will ask here because no solution from the internet and serverfault worked.

At this page: https://webmail.pixelwolf.ch/test/ there are some mysterious characters. And that's the problem why my Roundcube does not work.

What I already checked and tried:
1. added AddDefaultCharset UTF-8
2. changed to AddDefaultCharset to ISO xxx (dont know the string right now)
3. php5filter disabled
4. gzip checked (according to php returns junk characters at end of everything) but characters remain there

For notice: on my local server there aren't any of those characters. On local it just works.
So what can I check further?