Sec. 9. (a) An interactive computer service may, upon its own initiative, block the receipt or transmission through its service of any commercial electronic mail message that it reasonably believes is or will be sent in violation of this chapter.
(b) An interactive computer service is not liable for any action voluntarily taken in good faith to block the receipt or transmission through its service of any commercial electronic mail message that it reasonably believes is or will be sent in violation of this chapter.