My name is […] and I am an Author Relationship Executive at Packt Publishing

Today I received an email from someone claiming to be an Author Relationship Executive at Packt Publishing. They contacted me asking to author a beginners book on a certain piece of 3D modeling and animation software which I happen to be very familiar with. Intra nos, I am very familiar with the app and the topic specifics, but the email had a somewhat canned scent to it. I replied with some bit of info about myself, some questions and I am still waiting for reply. However in the meantime I googled a bit and judging by the results it appears that PACKT is hiring an army of contractors tasked with contacting semi-random potential "authors". Try googling for "I am an Author Relationship Executive at Packt Publishing". See what I mean? Makes me question the quality of any of their titles but most worryingly the credibility of the publisher. I am familiar with the app, but I can guarantee you that there are much more experienced candidates out there. Is this common practice? Have any of you been contacted by PACKT in a similar fashion?