Liu says Intro gives LinkedIn "NSA-level" access to users' email. The way the app works could also breach attorney-client privilege and doctor-patient confidentiality and violate a standard business rule that employees don't let third parties read internal emails.

LinkedIn points out the app is an opt-in product, one "that helps you be brilliant with people." If your boss forbids it or you don’t want it, then simply don’t install it.

The company says it’s not currently storing messages or analyzing emails for, say, key advertising words, the way Google's Gmail and Yahoo Mail do.

But according to LinkedIn, there’s no language in the company’s privacy policy that expressly forbids them from doing that in the future.

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Use LinkedIn? Its New Email App Raises Privacy Concerns