I've had the same one lots of times... Gets kinda obvious when every single email has the same subject, or is being sent by the same person more than once. My yahoo email address doesn't get those ones, but my hotmail one does.
I nearly got caught out one day but it was a good thing I opened the email.
I had no idea who it was from but it was in my spam folder and the subject was "Are you still looking for a new horse?" I was just about to delete it when I thought, hang on a minute, why would an email ask me if i was still looking for a horse, they don't know I ride. So I opened it (after checking through my inbox to see if i could find any clues.) and it happened to be from the people I had emailed a few months ago about a mare, that I never ended up buying... That's how I bought Mitchell, through that email.
R.I.P ~ Bubbles - 25yo tb mare - 13.04.2011 ~ 8:30am ~ passed away naturally and peacefully in my arms