Reference: List of Addressed Entity Messaging Software
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An email, even if it goes to a mailing list, differs from a public web page by being addressed. A video conferencing session differs from a video at some home page by being addressed. Machines, including chatbots, can read and write e-mail, but they might be too dumb to qualify as entities. A really capable AI based chatbot that passes the Turing test without mimicking a mentally disabled or dumb person is an entity.