This Nigerian/Russia scam is getting ridiculous,how do i block these"beautiful women"lol..from emailing me?

The pictures of these girls are hot,and after the third blond haired, blue eyed bombshell sent me a message that her father died in a car accident,and that i'm the first person to start a relationship with on the internet,and that they are a little short on cash to get their plain ticket,so they can return to the town in America, coincidentally... all those towns are very close to mine,and that they would want someone like me to take care of them..oh and all they want is to be in love and it last forever..oh and the best part is that 2 of the three wanted me to take my profile off the yahoo personals immediately,and very pushy about it..any way i want to stop their "electronic mails" from coming to me...