Fighting to get ISPConfig 3 up and runnung completely

[fosstux]

Hi!

As said in the title, I'm really fighting to get ISPConfig 3 up and runnung completely.

First of all, the Admin interface is working.

But:
1. Postfix says fatal: unsupported dictionary type: mysql. I've tried to fix it by using the postfix package from CentOS Plus repo, but there yum cannot find a package for postfix.
2. I am not sure where ISPConfig stores the vhost file for the domain. Can that be in /etc/httpd/conf/sites-available/domain.tld? If yes, the file seems to do something wrong: I get redirected to the default vhost. In the log I can see the following: "GET / HTTP/1.1" 403 5043 "-" "Mozilla/5.0 (X11; Linux x86_64; rv:9.0.1) Gecko/20100101 Firefox/9.0.1" - I get the 403 error. But why...
Oh yes, could it be that the problem exists due to external, manually created vhost files?

Please help!

Thanks.

Chritopher