While I understand why Alexandra Petri may not be the least bit thrilled by any of the changes Google has made to Gmail [“In redesigned Gmail, where’s ‘Return to Sender’?,” July 20], I am afraid that her op-ed column overlooked one of the fundamental realities of today’s data-driven Internet: Anytime you are using something “free,” you are not the consumer; you are the product.

Mark Scardiglia, Falls Church