We all get too much email. Some of which only applied before we became certified with (ISC)2.
At the (ISC)2 Security Congress, (ISC)2 CEO @david-shearer mentioned that he still gets emails for CISSP training. But he also said it is much easier to customize the email we receive.
At the bottom of the email look for the Click Here to manage your preferences.
This will take you to the Subscription Center where you can kindly ask not to receive emails for CISSP training.