"Developers may share data with third parties so long as they are transparent with the users about how they are using the data", Molinari wrote. Those tasks naturally require some automated processing of people's emails, but the Wall Street Journal previously reported that many email service companies have humans read emails to train and debug their algorithms.
This is different than scanning Gmail for data to be used for ad targeting, a practice that Google put a halt to previous year.
However, Google has told lawmakers that the company has protections in place to prevent potential abuse.
After facing a backlash over reports in July that third-party app developers can read your Gmail, Google has once again defended its policy to allow third-party apps to access and share data from Gmail accounts.
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These days, Google displays an "unverified app" warning for all apps that haven't been verified -- a change it introduce after someone previous year tricked millions of Gmail users into granting access to a bogus Google Docs apps.
Molinari also addressed whether Google employees ever peek into your inbox.
Google made no comment to CNN but referred them to a blog post in which it explains the review process, automatic and manual safeguarding, app testing and assessment of policy.
Google and other tech companies are set to face the Senate next week in a hearing over data privacy.