in response to Thomas Tabler: That message looks like spam, I'd delete it without decoding the base64. I too receive spams, HTML or non-HTML, that are base64-encoded. If it looks like spam judging from the headers, I delete without decoding the base64.
Headers in the message you received show the message traveled through .cn top-level domain, meaning they used an open relay to hide their tracks, which in turn means they're not legit.
