How can we change the options for, or turn off, the email "Moderated message awaits approval at..." emails?

When there are NO messages needing approval and you click the "Check Moderated" toolbar option, the dialog changes and you will see:


When should we email you notifications that items are waiting?

Only for the first moderated item needing approval

For every item needing approval

      Number of minutes delay before we email you:

Never