finally and after work with the proxy developer (i really thank him for his support)
i was able to install and configure a fully working antispam solution that is suitable to be outgoing antispam filter for midsized or even isp level.
i didn't find it would be suitable to write down all the details in here.
but you can find it on my blog:
i hope you find it useful. please let me know if you have any questions or inquires.regarding the solution