Royal Dutch Shell Grant Award review: harassing emails

I keep receiving emails telling me I have won, I realize this is a scam. How do you stop the emails? I am sick of them.

This is what I get:

This is to inform you that you have been selected as one of the winners of this year Royal Dutch shell grant award of $2, 000, 000.00, for details contact the Executive secretary Email: [protected]@btinternet.com

Regards
Monica Dickson.