Book publicity company: Neglected to BCC everyone (public instead).
Other book publicity company: I don't usually send rejections, because I've had some dodgy responses to those. But this company followed up, so I rejected. Then received a "If you don't want to read it, how about a guest post your readers may like". I sent a curt rejection to that, too. If I don't want to read the book, I don't want to promote the book or the author. That's it.