The email route is considered obsolete because it renders only the Mobi 7 version, so you don't see how your book looks on a KF8 device or app. Anyhow, I am skeptical it would render a PDF at all.
The way to do this is through the Personal Document service. I have done it, when sent a PDF review copy. It was a bit of a pain, but it was doable. I don't remember the exact procedure just now, but I'm sure it is in the help section of Manage Your Digital Content & Devices.
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