spam that bogofilter is not catching

[Terry Todd]

I have been getting some nasty spam that bogofilter is not catching.
It is a very short message from a different source every time but
always has a url that points to the same IP address.  The url
changes but the IP doesn't.  Does anyone have any ideas on how to
deal with this type of thing?

I could send some examples.  I have to warn you though they are bad.

Thanks,
Terry Todd