Email Short Code

emailshortcode.php

<?php
// Hide Email from Spam Bots

function cwc_mail_shortcode( $atts , $content = null ) {
	if ( ! is_email( $content ) )
		return;

	for ( $i = 0; $i < strlen( $content ); $i++ )
		$encodedmail .= "&#" . ord( $content[$i] ) . ';';
	return '<a href="' . esc_url( 'mailto:' . $encodedmail ) . '">Email</a>';
}
add_shortcode( 'email', 'cwc_mail_shortcode' );

Improved @robertdall's shortcode by:

• using WordPress coding standards
• removing the image in the link, that seemed very specific to the Robert's use case and not general use
• adding validation that the passed string in $content is an email address, and if not, just return out of the function, avoiding potential issues if it wasn't an email address
• added proper output escaping to the link, for security reasons

Sorry I forgot to remove the image links when I uploaded it last night :-) That's what I get for multi-tasking and copy and pasting at the meetup… 

you can use the http://codex.wordpress.org/Function_Reference/antispambot function as well