SMTP Proxy in Bridge Mode

Hello,

after posting my question to the German forum (without answers) i try my best here:

i have just installed my Astaro 110 in bridge mode with the firewall policy Any/Any/Any :) I can access the internet through the ASG. Now I wanted to add the AntiSPAM and AntiVIRUS features:

1) Added our domain to the routing tab and added our internal IP of our mailserver to the host list.
2.) Relaying -> Host-based relay the whole internal network
3) Advanced:

If i turn on the Transparent mode, the emails are looped back, if i the internal mail server to the skip list, the email is not inspected.

What am i doing wrong?

Thank,
Damjan