I got the same scam email when I had a horse listed on Dreamhorse.com They even wanted to ship her to Spain. They used the shipping cost as a reason to give me more than I was asking for the horse. It was a really weird deal, I reported it to Dreamhorse and emailed the person that I knew it was a scam but didn't look into reporting it elsewhere. I just wonder how many people have gotten scammed.
Glad I wasn't one of them.