Page 1 of Blank e-mails ???

During the past week I have started recieving blank e-mails,by blank I mean no information in To/From/Subject or in the body of the text therefore I can`t set up any filters to automatically dump these incoming e-mails. Anybody got any suggestions as to whether they are virus related or how to stop them ? I am running Norton which is up to date and a full scan shows nothing.
I am getting up to 10 a day & it is showing no signs of letting up, the whole file is only 1kb so it seems to be empty ?

Any help appreciated.

Gran.

I`ve started getting loads aswell.
I use MailWasher so I`m not actually downloading them but it seems to be a new spamming technique because you can`t blacklist or bounce it :-(

Also recently there are mails with the title "unable to deliver" etc. These are viruses and should be deleted..

OK but if it is spamming what is the point as there is nothing in the email ??? :/

Oh right. I`ve been getting them with no `from` address.