Our system will automatically send you an email when your account has been logged into, or when a return is opened.
If you logged into your TurboTax account and opened your return, then you accessed the information and therefore that is the reason for the email you received.
You can verify your account activity by following the steps in TurboTax FAQ: How can I check the activity in my TurboTax account?
This question was previously answered by MichelleLO
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