This is a very misleading title. Bad spam filters are not the same as censorship.
The end of the article asks, "Who gave Verizon the power to decide what their customers can tell each other?"
No one did. Verizon's customers can (and should) be using a different mail service. Hardly anyone uses their ISP's email, especially because a lot of people switch ISPs often.
So it looks like somebody here is relying on Verizon Fios to handle their business mail?
That's just stupid. Run your mail servers in house, or find a hosted service that provides business-class feature sets and control.