I published a paper a last month and I just got this email from Wiley. I checked the name of the sender and it lines up.
Is this even legit? The person refers to me as Dr. even though I am a PhD student.

>In this regard, I was wondering if you have ever given thoughts to expanding your work and putting together an edited/multi-edited reference volume(s) on a related research topic. With great pleasure, I wanted to extend an invitation to you today, for contributing your outstanding research work to the ... book series. Should you be interested in learning more about the ... and developing a book as the primary Editor/Editor in Chief, please do not hesitate to contact me. If you would like to hear more about it, I am happy to send you more details on the book development process, at your convenience.