Facebook e-mail is going caput
Three afters (November 2010) Facebook email is going away. If you use an email address @facebook.com, you need to start sending notice to your contacts again using your primary email address from Google Gmail, Microsoft Outlook or Yahoo.
I personally don’t use @facebook.com email address for sending and receiving emails due to privacy concern keeping them at Facebook. It’s my decision, and glad I did.
Read more at CNN.