Most sites that offer some kind of registration on the internet ask for your email, some of them send unwanted commercial messages. If you use Firefox, Baixe.net has a solution to show you: My Spambox: It generates a fictitious email that will be associated with your real email, this email account will be active for 12 hours, enough for you to receive all messages related to the registration you made. This temporary email will work as a simple and useful email forwarder!