You sign up at MuguGuestbook, they put you on a list (link: here). Scammers just go there and paste it into their email client without even thinking about it.
Fun fact: Mugu is Nigerian slang for ‘‘idiot’’.
You won’t get an email every second, but expect to get at least one daily.
There is a whole tutorial on Scammer.info for you, I could have just sent you that but it’s okay.
Here’s the link: How to find 419 text/email scams