Doesn't the CAN-SPAM act make it legal to send unsolicited bulk email?

The United States federal law known as the CAN-SPAM Act of 2003 sets out a list of certain things that are explicitly illegal to do when sending bulk mail.

Some people think this means that email companies are required to accept any bulk mail that doesn’t violate the law, but that’s not the case. In fact, the law explicitly allows service providers to set their own stricter anti-spam policies.

The spam policy we have chosen completely forbids the sending of unsolicited bulk messages. All reputable service providers use a similar policy. This policy is a legally binding part of the contract our customers agree to when they open an account with us.