unless it is 
empty. Otherwise, everyone receiving the message will see it and that is
exactly what you <em>don't</em> want to happen!
</ul>

<p class=note>
I hope this clarifies the issue. Otherwise, please refer to 
<a href="http://www.ietf.org/rfc/rfc2821.txt">RFC 2821</a>
and
<a href="http://www.ietf.org/rfc/rfc2822.txt">RFC 2822</a>.
</p>

<pre class=example>
-- load the smtp support
local smtp = require("socket.smtp")

-- Connects to server "localhost" and sends a message to users
-- "fulano@example.c