Picture, if you will, an e-mail from one "Elvin LAWSON" (@movemail.com) sent to one of my many e-mail accounts. With the subject "Employment opportunity".
Got it so far? Good. Being a suspicious chap who currently has no need for viagra or whatever it is the spammers are selling today, I'm viewing the source of the e-mail before opening it proper.
It's multipart/alternative MIME, with an empty text/plain section. That makes it almost certainly spam.
And then the text/html part. The entire visible portion of it is a size 2 nbsp.
I'm left looking at this thinking "It's spam, but what's the point of it?"