It is also possible for scammers to make convincing look-alike emails. You could forward the email to security@intuit.com for investigation.
Also, as a result of taxpayer privacy laws, the marketing department that sends emails advertising Turbotax does not actually know anything about your finances. At most, they know if you have an account, and they know if you filed a return from that account. They don't know your income, or that you didn't file because you weren't required, and they also don't know if you filed with another tax provider. The message, "if you are late, you might owe penalties" is potentially true for anyone.
Lastly, if you log in to your main turbotax account and check your privacy preferences, you may be able to turn off most marketing emails. I haven't looked at the privacy setting recently but I don't get those emails so there may be a way of turning them off.
