n SMTP mail message receives a copy of the
message body along with the headers, and nothing more.  The headers
<em>are</em> part of the message and should be produced by the 
<a href="http://lua-users.org/wiki/FiltersSourcesAndSinks">LTN12</a> 
<tt>source</tt> function. The <tt>rcpt</tt> list is <em>not</em>
part of the message and will not be sent to anyone.
</p>

<p class=note>
<a href="http://www.ietf.org/rfc/rfc2822.txt">RFC 2822</a>
has two <em>important and short</em> sections, "3.6.3. Destination add