The only knobs to control this are in Organization --> Settings
But there's so many things these settings don't catch that, to us, they are effectively useless. We've expressed our desire for better control over both the emails and the banners to Meraki many times. Though our concern is also around that our customers get these emails too, which we don't want.
You should see how many emails I get in a day... It's significantly more than 10 😞