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Newsletters don't come out very often - mostly because the author isn't doing much more than writing. Chances are, there won't be more than one or two newsletters each month, so you fortunately won't have to worry about your inbox becoming clogged with garbage. Most of the newsletters will be about book releases, letting you know when the newest book is out.
Your privacy is taken very seriously here. Your email address shall never be disclosed to a third-party, or a fourth party - do those even exist? Either way, don't worry about someone getting a hold of your email. The author hates it when he gets random garbage in his inbox, so he understands that you probably don't want your inbox becoming filled with detritus either.