Sending private Classmates Email is easy. Just find the person you'd like to contact and click Send Email or the envelope icon on their profile page. Compose your message in the space provided and click Send.
Your friend will receive an email notification that a new message is waiting in their Classmates Inbox (unless they've opted out of email notifications). While most people respond quickly to Classmates Email, keep in mind that your friend might not check his or her email often, so there could be some delay.