If you do not want to receive the email notifications anymore, you'll have to turn off the extra data transfer option. To do this:

1. Sign in to your GeoCities account.
2. On the Home tab, scroll down to the Site Status module, then click "Buy more data transfer."
3. On the following page, you'll be able to choose whether to automatically add data transfer to your plan as needed. If you want us to keep your site active and charge you $5 for each additional 5GB of data transfer you need, select the first radio button. If you'd rather we temporarily shut down your site when you exceed your data transfer allotment, choose the second button.
4. Click "Submit."

If you change your mind and would like to receive emails again, you can return to this page anytime and update your preferences. Keep in mind that notification emails come only with the extra data transfer option.