1) You'll get that email every time you download your tax forms to your home computer.....so it could just be you downloading your own tax forms.
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2) Could also be someone else who downloaded their own forms, from their own account..but they mis-typed their own email address...and lucky you, are getting the notification because of their screw-up.
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IF you are uncomfortable about this, log into your tax file....go down to the lower left corner to "Intuit Account" , and change your "UserID" and Password (but write them down...next week, you'll try logging in to the old UserID and it won't work)