Unbeliveable amount of spam

[GPGrieco]

I'm having a really big problem with spam. I created an online forum for my business for customers and potential customers to come and discus products, technical support, etc. I added owners manuals, basic how-to's etc to my site, but haven't gotten any members to the site yet. All I have is spam, and lots of it. In the last 5 hours I got over 800 spam posts alone. I can't possibly keep up deleting all of them, then banning the member. Each post seems to be using a different IP and each user only posts a few posts and then uses a different user. Any suggestions?

[Kindred]

http://wiki.simplemachines.org/smf/Spam_-_my_forum_is_flooded_with_spam,_what_can_I_do