Email ID – Spammers

This seems to work, no shortcode around e-mail address needed.

/**
 * Hide email from Spam Bots using a shortcode.
 *
 * @param array  $atts    Shortcode attributes. Not used.
 * @param string $content The shortcode content. Should be an email address.
 *
 * @return string The obfuscated email address.
 */
function wpcodex_hide_email_shortcode( $atts , $content = null ) {
	if ( ! is_email( $content ) ) {
		return;
	}

	return '<a href="mailto:' . antispambot( $content ) . '">' . antispambot( $content ) . '</a>';
}
add_shortcode( 'email', 'wpcodex_hide_email_shortcode' );