Make sure your origin web server only allows connections from the Cloudflare proxy by setting your firewall to allow connections to ports 80 and 443 only from these IP addresses…
$ curl http://mail.lewisimages.com
<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN">
<html><head>
<title>301 Moved Permanently</title>
</head><body>
<h1>Moved Permanently</h1>
<p>The document has moved <a href="https://mail.lewisimages.com/403.shtml">here</a>.</p>
Maybe you have changed something since your post, but if I visit the address you gave, it redirects to an (https) error page, but not to www.lewisimages.com.