Email to subscribers custom post type content

Hi all,

I’m trying to find a way to email custom post type contents to all subscribers upon publishing that custom post type. I found similar solution on stackoverflow: https://wordpress.stackexchange.com/questions/100644/how-to-auto-send-email-when-publishing-a-custom-post-type

add_action( 'transition_post_status', 'send_mails_on_publish', 10, 3 );

function send_mails_on_publish( $new_status, $old_status, $post )
{
    if ( 'publish' !== $new_status or 'publish' === $old_status
        or 'my_custom_type' !== get_post_type( $post ) )
        return;

    $subscribers = get_users( array ( 'role' => 'subscriber' ) );
    $emails      = array ();

    foreach ( $subscribers as $subscriber )
        $emails[] = $subscriber->user_email;

    $body = sprintf( 'Hey there is a new entry!
        See <%s>',
        get_permalink( $post )
    );

    wp_mail( $emails, 'New entry!', $body );
}

That particular solution sends a generic email to subscribers. What I want is to include the contents of the custom post type in the email. Kind of like a newsletter, but using custom post type.