You're absolutely right - this is a good reason for having a users e-mail. There are probably many others as well. You just shouldn't request an obligatory ema

You're absolutely right - this is a good reason for having a users e-mail. There are probably many others as well. You just shouldn't request an obligatory email adress, or even worse a confirmation by email, unless you really have to. It tends to scare a lot of users away.