Hi, I have 8 years of experience as Linux servers Administrator in hosting company in Poland. In my work I've installed many mail servers (Postfix, Exim), configured many mail hosting services. Now I'm dealing with maintenance couple of mail servers with 4000-10000 users. Generally mail service, spam problems I know perfect. I have my own best PERL script for cleaning. I cleaned with it many even big lists. You will get clean addressed with it even with answers from servers. Very very good script for correct price - 100$. It support hard and soft bounces - very good soft.