Of hyphens and e-lectronics

We use a modified Chicago style here on the Seattle Review of Books. Recently, editing a piece that used the term ‘ebook’ sparked a discussion over which was better: ‘e-book’ or ‘ebook’? To our eyes, ‘e-mail’ seems antiquated (we use ‘email’), but are electronic books different? They are more modern, after all. If we have to designated something as electronic, as opposed to analog, is the hyphen still necessary?

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