Visual Invite is a component to allows visitors to recommend or invite their friends to visit your website by e-mail. It incorporates ReCaptcha security to help prevent spam. There is also an option to import e-mails with Plaxo Address Book widget: It allows your users to grab their contacts' emails from Gmail, Yahoo, AOL, Outlook, Plaxo etc...

Features:
-Custom message by visitor
-Delay to re-send
-max emails by day
-max emails per send
-Import e-mails from address Book
-ReCaptcha security.