Chain Mail?

1

So I get this letter with no return address today. Suspicious enough, I open it and it’s filled with anthrax. I lied. It was three pages of explinations about some scheme that was invented about how if I send one dollar to everyone on the list I was provided (6 people), my name would be added and I’d be rich in a month. Anyone else get letters like this? Isn’t it required to have a return address? The postoffice stamp over the stamp says Gulfport MS 395, where’s that?