I spend half my time clearing this crap up and only as as a hobby - alledgely.
FFS when is someone going to stop spam ?
It's spam with a virus/worm.
As has previously been said, don't open it, delete it.
There are many mail cleaners - you can use Mailwasher which will allow you to see your mail and chose what to accept before actually downloading it from your mail server.
Other than that live with it sadly, as we all do.
Mailwasher is a freeware product u can download.