Due hacking intrussion last week I've changed all my pages to a dedicated server.

Now, my ip is listed on three blacklist of spam.
How can I identify the source of spam?, internal or external?.
How can I know if is there any spam script?

Sorry for my english.

Regards, Jose Sanchez Martin

There must be some security holes in your scripts through which the Spam was sent.To check the source of spam you are to check up your log files.Moreover, I advise you to optimize all your scripts in order not to have such problems in future.