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Hi,
The API key is always visible on the page (that’s just how Google Maps works). In theory, someone else could use your key if it’s unrestricted (to show their own maps).
To prevent that, you can restrict the key by “referer” to make sure that it’s only used on your site. Please see the MapPress FAQ for more information, and a link to Google’s FAQ about how to restrict keys.
I’m not sure why you received an email if your key is already restricted – maybe Google just sent a notice for every key? In any case, it’s probably worth just double checking that a referer restriction is present.
Thank you so much for the quick reply and resolution!