A simple link that open users default email client to send that WordPress Post or Page as an email to a friend or colleague. It displays an excerpt in the email body
<a href="mailto:type email address here?subject=I wanted to share this post with you from <?php bloginfo('name'); ?>&body=<?php the_title('','',true); ?>  <?php the_permalink(); ?>" title="Email to a friend/colleague" target="_blank">Share via Email</a>