Strange spam with subject,sender, and recipient blank

I have been receiving in my two public email addresses spam with subject, sender, and recipient spaces blank. Thunderbird's spam filter catches them. I have received emails with subject blank, but this I have never seen until now.I am only concerned a little because Online Armor and NOD32 both also check emails. Have you experienced this?

 

Yes I was having the same problem about a week ago it stopped. It went on for a couple weeks and I would get about 1 a minute some times. I found the site it said they were comming from in the headers and I wish I could remember it. But subject and from and body was blank. Now my daughter is getting some mails the same way except they are from mailer@mus021house.com but about one a minute 264,023 kb in size with all kinds of crazy text in them.

Thanks,

Chris