After a recent Fussy Librarian of my permafree, I received an email a day later from FreeBooksy, saying they'd featured the same title. For free, which was as nice as it was unexpected (and almost as effective d/l-wise as Fussy).
The day after that I received an email from Dango Books also offering to promote the book for free. I'd never heard of them, but they seemed legit, so I thought about it for a day and had a follow-up email from them. I attempted to reply, only to receive a non-delivery notice that my message had a high probability of spam. (I hope that all makes sense - I'm not sure I'm quite awake.)
What do you think? Should I ignore it? Was their original email to me spam? Is Dango Boooks for real?