turns a <em>simple</em> 
<a href="http://lua-users.org/wiki/FiltersSourcesAndSinks">LTN12</a> 
source that produces the
message contents as defined by <tt>mesgt</tt>, chunk by chunk. 
Hopefully, the following
example will make things clear. When in doubt, refer to the appropriate RFC
as listed in the introduction.  </p>

<pre class=example>
-- load the smtp support and its friends
local smtp = require("socket.smtp")
local mime = require("mime")
local ltn12 = require("ltn12")

-- creates a source to send a m