At the bottom of each of your posts is that little Email Icon. You can click on that to send that person an email without knowing (or getting) their email address - the email is sent to you through RCU and from RCU. If you decide to reply to te person, you will reply directly to THEIR email address and then they will have yours. It's a security feature to keep you email address hidden from the public.

But a spammer can come in here and send many emails through this system. They do not do it often because they have to do one at a time instead of sending out one email to thousands of people in one shot.