2003-08-31 03:00:15 +02:00
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"
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"http://www.w3.org/TR/html4/strict.dtd">
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<html>
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<head>
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2004-06-21 08:07:58 +02:00
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<meta name="description" content="LuaSocket: SMTP support">
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2004-11-28 09:17:16 +01:00
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<meta name="keywords" content="Lua, LuaSocket, SMTP, E-Mail, MIME, Multipart,
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Library, Support">
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2004-06-21 08:07:58 +02:00
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<title>LuaSocket: SMTP support</title>
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2003-08-31 03:00:15 +02:00
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<link rel="stylesheet" href="reference.css" type="text/css">
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</head>
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<body>
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<!-- header +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
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<div class=header>
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<hr>
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<center>
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<table summary="LuaSocket logo">
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<tr><td align=center><a href="http://www.lua.org">
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2004-06-21 08:07:58 +02:00
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<img width=128 height=128 border=0 alt="LuaSocket" src="luasocket.png">
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2003-08-31 03:00:15 +02:00
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</a></td></tr>
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<tr><td align=center valign=top>Network support for the Lua language
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</td></tr>
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</table>
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<p class=bar>
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2009-05-27 11:31:38 +02:00
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<a href="index.html">home</a> ·
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<a href="index.html#download">download</a> ·
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2004-12-13 07:26:01 +01:00
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<a href="installation.html">installation</a> ·
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2003-08-31 03:00:15 +02:00
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<a href="introduction.html">introduction</a> ·
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<a href="reference.html">reference</a>
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</p>
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</center>
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<hr>
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</div>
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<!-- smtp +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
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<h2 id=smtp>SMTP</h2>
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2004-06-16 22:41:03 +02:00
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<p> The <tt>smtp</tt> namespace provides functionality to send e-mail
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messages. The high-level API consists of two functions: one to
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define an e-mail message, and another to actually send the message.
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Although almost all users will find that these functions provide more than
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enough functionality, the underlying implementation allows for even more
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control (if you bother to read the code).
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</p>
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<p>The implementation conforms to the Simple Mail Transfer Protocol,
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2011-05-25 22:57:22 +02:00
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<a href="http://www.ietf.org/rfc/rfc2821.txt">RFC 2821</a>.
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2004-06-15 08:24:00 +02:00
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Another RFC of interest is <a
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2011-05-25 22:57:22 +02:00
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href="http://www.ietf.org/rfc/rfc2822.txt">RFC 2822</a>,
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2003-08-31 03:00:15 +02:00
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which governs the Internet Message Format.
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2004-06-21 08:07:58 +02:00
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Multipart messages (those that contain attachments) are part
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2004-06-15 08:24:00 +02:00
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of the MIME standard, but described mainly
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2011-05-25 22:57:22 +02:00
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in <a href="http://www.ietf.org/rfc/rfc2046.txt">RFC 2046</a>
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2003-08-31 03:00:15 +02:00
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2004-06-15 08:24:00 +02:00
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<p> In the description below, good understanding of <a
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href="http://lua-users.org/wiki/FiltersSourcesAndSinks"> LTN012, Filters
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sources and sinks</a> and the <a href=mime.html>MIME</a> module is
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assumed. In fact, the SMTP module was the main reason for their
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creation. </p>
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2003-08-31 03:00:15 +02:00
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2004-06-16 22:41:03 +02:00
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<p>
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To obtain the <tt>smtp</tt> namespace, run:
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</p>
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<pre class=example>
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-- loads the SMTP module and everything it requires
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2005-02-08 11:01:01 +01:00
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local smtp = require("socket.smtp")
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2004-06-16 22:41:03 +02:00
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</pre>
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2003-08-31 03:00:15 +02:00
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<p>
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MIME headers are represented as a Lua table in the form:
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</p>
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<blockquote>
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<table summary="MIME headers in Lua table">
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<tr><td><tt>
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headers = {<br>
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field-1-name = <i>field-1-value</i>,<br>
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field-2-name = <i>field-2-value</i>,<br>
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2004-06-16 22:41:03 +02:00
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field-3-name = <i>field-3-value</i>,<br>
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...<br>
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2003-08-31 03:00:15 +02:00
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field-n-name = <i>field-n-value</i><br>
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}
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</tt></td></tr>
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</table>
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</blockquote>
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<p>
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2012-04-22 18:18:45 +02:00
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Field names are case insensitive (as specified by the standard) and all
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functions work with lowercase field names (but see
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<a href=socket.html#headers.canonic><tt>socket.headers.canonic</tt></a>).
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2003-08-31 03:00:15 +02:00
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Field values are left unmodified.
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</p>
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<p class=note>
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Note: MIME headers are independent of order. Therefore, there is no problem
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in representing them in a Lua table.
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</p>
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2004-06-15 08:24:00 +02:00
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<p>
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2004-06-21 08:07:58 +02:00
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The following constants can be set to control the default behavior of
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2004-06-15 08:24:00 +02:00
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the SMTP module:
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</p>
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2003-08-31 03:00:15 +02:00
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2004-06-15 08:24:00 +02:00
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<ul>
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<li> <tt>DOMAIN</tt>: domain used to greet the server;
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<li> <tt>PORT</tt>: default port used for the connection;
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<li> <tt>SERVER</tt>: default server used for the connection;
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<li> <tt>TIMEOUT</tt>: default timeout for all I/O operations;
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<li> <tt>ZONE</tt>: default time zone.
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</ul>
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2016-03-04 19:36:32 +01:00
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<!-- message ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
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<p class=name id=message>
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smtp.<b>message(</b>mesgt<b>)</b>
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</p>
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<p class=description>
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Returns a <em>simple</em>
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<a href="http://lua-users.org/wiki/FiltersSourcesAndSinks">LTN12</a> source that sends an SMTP message body, possibly multipart (arbitrarily deep).
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</p>
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<p class=parameters>
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The only parameter of the function is a table describing the message.
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<tt>Mesgt</tt> has the following form (notice the recursive structure):
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</p>
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<blockquote>
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<table summary="Mesgt table structure">
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<tr><td><tt>
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mesgt = {<br>
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headers = <i>header-table</i>,<br>
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body = <i>LTN12 source</i> or <i>string</i> or
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<i>multipart-mesgt</i><br>
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}<br>
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<br>
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multipart-mesgt = {<br>
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[preamble = <i>string</i>,]<br>
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[1] = <i>mesgt</i>,<br>
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[2] = <i>mesgt</i>,<br>
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...<br>
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[<i>n</i>] = <i>mesgt</i>,<br>
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[epilogue = <i>string</i>,]<br>
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}<br>
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</tt></td></tr>
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</table>
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</blockquote>
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<p class=parameters>
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For a simple message, all that is needed is a set of <tt>headers</tt>
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and the <tt>body</tt>. The message <tt>body</tt> can be given as a string
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or as a <em>simple</em>
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<a href="http://lua-users.org/wiki/FiltersSourcesAndSinks">LTN12</a>
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source. For multipart messages, the body is a table that
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recursively defines each part as an independent message, plus an optional
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<tt>preamble</tt> and <tt>epilogue</tt>.
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</p>
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<p class=return>
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The function returns a <em>simple</em>
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<a href="http://lua-users.org/wiki/FiltersSourcesAndSinks">LTN12</a>
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source that produces the
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message contents as defined by <tt>mesgt</tt>, chunk by chunk.
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Hopefully, the following
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example will make things clear. When in doubt, refer to the appropriate RFC
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as listed in the introduction. </p>
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<pre class=example>
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-- load the smtp support and its friends
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local smtp = require("socket.smtp")
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local mime = require("mime")
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local ltn12 = require("ltn12")
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-- creates a source to send a message with two parts. The first part is
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-- plain text, the second part is a PNG image, encoded as base64.
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source = smtp.message{
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headers = {
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-- Remember that headers are *ignored* by smtp.send.
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from = "Sicrano de Oliveira <sicrano@example.com>",
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to = "Fulano da Silva <fulano@example.com>",
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subject = "Here is a message with attachments"
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},
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body = {
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preamble = "If your client doesn't understand attachments, \r\n" ..
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"it will still display the preamble and the epilogue.\r\n" ..
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"Preamble will probably appear even in a MIME enabled client.",
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-- first part: no headers means plain text, us-ascii.
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-- The mime.eol low-level filter normalizes end-of-line markers.
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[1] = {
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body = mime.eol(0, [[
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Lines in a message body should always end with CRLF.
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The smtp module will *NOT* perform translation. However, the
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send function *DOES* perform SMTP stuffing, whereas the message
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function does *NOT*.
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]])
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},
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-- second part: headers describe content to be a png image,
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-- sent under the base64 transfer content encoding.
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-- notice that nothing happens until the message is actually sent.
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-- small chunks are loaded into memory right before transmission and
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-- translation happens on the fly.
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[2] = {
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headers = {
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["content-type"] = 'image/png; name="image.png"',
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["content-disposition"] = 'attachment; filename="image.png"',
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["content-description"] = 'a beautiful image',
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["content-transfer-encoding"] = "BASE64"
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},
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body = ltn12.source.chain(
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ltn12.source.file(io.open("image.png", "rb")),
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ltn12.filter.chain(
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mime.encode("base64"),
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mime.wrap()
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)
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)
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},
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epilogue = "This might also show up, but after the attachments"
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}
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}
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-- finally send it
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r, e = smtp.send{
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from = "<sicrano@example.com>",
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rcpt = "<fulano@example.com>",
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source = source,
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}
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</pre>
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2004-06-15 08:24:00 +02:00
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<!-- send +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
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<p class=name id=send>
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smtp.<b>send{</b><br>
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from = <i>string</i>,<br>
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rcpt = <i>string</i> or <i>string-table</i>,<br>
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source = <i>LTN12 source</i>,<br>
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2004-06-16 22:41:03 +02:00
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[user = <i>string</i>,]<br>
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[password = <i>string</i>,]<br>
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[server = <i>string</i>,]<br>
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2004-11-17 05:55:57 +01:00
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[port = <i>number</i>,]<br>
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2004-06-16 22:41:03 +02:00
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[domain = <i>string</i>,]<br>
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[step = <i>LTN12 pump step</i>,]<br>
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2005-08-12 07:56:32 +02:00
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[create = <i>function</i>]<br>
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2003-08-31 03:00:15 +02:00
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<b>}</b>
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</p>
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<p class=description>
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2004-06-15 08:24:00 +02:00
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Sends a message to a recipient list. Since sending messages is not as
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simple as downloading an URL from a FTP or HTTP server, this function
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doesn't have a simple interface. However, see the
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<a href=#message><tt>message</tt></a> source factory for
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a very powerful way to define the message contents.
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2003-08-31 03:00:15 +02:00
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</p>
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2005-08-12 07:56:32 +02:00
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2003-08-31 03:00:15 +02:00
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<p class=parameters>
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2004-06-15 08:24:00 +02:00
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The sender is given by the e-mail address in the <tt>from</tt> field.
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<tt>Rcpt</tt> is a Lua table with one entry for each recipient e-mail
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address, or a string
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2003-08-31 03:00:15 +02:00
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in case there is just one recipient.
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2004-06-16 22:41:03 +02:00
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The contents of the message are given by a <em>simple</em>
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<a href="http://lua-users.org/wiki/FiltersSourcesAndSinks">LTN12</a>
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<tt>source</tt>. Several arguments are optional:
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2004-06-16 06:28:21 +02:00
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</p>
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2004-06-15 08:24:00 +02:00
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<ul>
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2004-06-16 06:28:21 +02:00
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<li> <tt>user</tt>, <tt>password</tt>: User and password for
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authentication. The function will attempt LOGIN and PLAIN authentication
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methods if supported by the server (both are unsafe);
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2004-06-15 08:24:00 +02:00
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<li> <tt>server</tt>: Server to connect to. Defaults to "localhost";
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<li> <tt>port</tt>: Port to connect to. Defaults to 25;
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<li> <tt>domain</tt>: Domain name used to greet the server; Defaults to the
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local machine host name;
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2004-06-16 22:41:03 +02:00
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<li> <tt>step</tt>:
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<a href="http://lua-users.org/wiki/FiltersSourcesAndSinks">LTN12</a>
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pump step function used to pass data from the
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2005-08-12 07:56:32 +02:00
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source to the server. Defaults to the LTN12 <tt>pump.step</tt> function;
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2005-10-05 05:16:17 +02:00
|
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|
<li><tt>create</tt>: An optional function to be used instead of
|
2005-08-12 07:56:32 +02:00
|
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|
<a href=tcp.html#socket.tcp><tt>socket.tcp</tt></a> when the communications socket is created.
|
2004-06-15 08:24:00 +02:00
|
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|
</ul>
|
2003-08-31 03:00:15 +02:00
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|
<p class=return>
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If successful, the function returns 1. Otherwise, the function returns
|
2004-01-24 03:47:24 +01:00
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<b><tt>nil</tt></b> followed by an error message.
|
2003-08-31 03:00:15 +02:00
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</p>
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|
2004-06-15 08:24:00 +02:00
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|
<p class=note>
|
2005-08-12 07:56:32 +02:00
|
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|
Note: SMTP servers can be very picky with the format of e-mail
|
2004-06-15 08:24:00 +02:00
|
|
|
addresses. To be safe, use only addresses of the form
|
2004-06-21 00:19:54 +02:00
|
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|
"<tt><fulano@example.com></tt>" in the <tt>from</tt> and
|
2004-06-15 08:24:00 +02:00
|
|
|
<tt>rcpt</tt> arguments to the <tt>send</tt> function. In headers, e-mail
|
|
|
|
|
addresses can take whatever form you like. </p>
|
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|
2003-08-31 03:00:15 +02:00
|
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|
<p class=note>
|
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|
|
Big note: There is a good deal of misconception with the use of the
|
|
|
|
|
destination address field headers, i.e., the '<tt>To</tt>', '<tt>Cc</tt>',
|
|
|
|
|
and, more importantly, the '<tt>Bcc</tt>' headers. Do <em>not</em> add a
|
|
|
|
|
'<tt>Bcc</tt>' header to your messages because it will probably do the
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|
|
|
|
exact opposite of what you expect.
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|
</p>
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|
|
<p class=note>
|
2004-06-15 08:24:00 +02:00
|
|
|
Only recipients specified in the <tt>rcpt</tt> list will receive a copy of the
|
2003-08-31 03:00:15 +02:00
|
|
|
message. Each recipient of an SMTP mail message receives a copy of the
|
2004-06-15 08:24:00 +02:00
|
|
|
message body along with the headers, and nothing more. The headers
|
2004-06-16 22:41:03 +02:00
|
|
|
<em>are</em> part of the message and should be produced by the
|
|
|
|
|
<a href="http://lua-users.org/wiki/FiltersSourcesAndSinks">LTN12</a>
|
2004-06-15 08:24:00 +02:00
|
|
|
<tt>source</tt> function. The <tt>rcpt</tt> list is <em>not</em>
|
|
|
|
|
part of the message and will not be sent to anyone.
|
2003-08-31 03:00:15 +02:00
|
|
|
</p>
|
|
|
|
|
|
|
|
|
|
<p class=note>
|
2011-05-25 22:57:22 +02:00
|
|
|
<a href="http://www.ietf.org/rfc/rfc2822.txt">RFC 2822</a>
|
2003-08-31 03:00:15 +02:00
|
|
|
has two <em>important and short</em> sections, "3.6.3. Destination address
|
|
|
|
|
fields" and "5. Security considerations", explaining the proper
|
|
|
|
|
use of these headers. Here is a summary of what it says:
|
|
|
|
|
</p>
|
|
|
|
|
|
|
|
|
|
<ul>
|
|
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|
<li> <tt>To</tt>: contains the address(es) of the primary recipient(s)
|
|
|
|
|
of the message;
|
|
|
|
|
<li> <tt>Cc</tt>: (where the "Cc" means "Carbon Copy" in the sense of
|
|
|
|
|
making a copy on a typewriter using carbon paper) contains the
|
|
|
|
|
addresses of others who are to receive the message, though the
|
|
|
|
|
content of the message may not be directed at them;
|
|
|
|
|
<li> <tt>Bcc</tt>: (where the "Bcc" means "Blind Carbon
|
|
|
|
|
Copy") contains addresses of recipients of the message whose addresses are not to be revealed to other recipients of the message.
|
|
|
|
|
</ul>
|
|
|
|
|
|
|
|
|
|
<p class=note>
|
2004-06-15 08:24:00 +02:00
|
|
|
The LuaSocket <tt>send</tt> function does not care or interpret the
|
|
|
|
|
headers you send, but it gives you full control over what is sent and
|
|
|
|
|
to whom it is sent:
|
2003-08-31 03:00:15 +02:00
|
|
|
</p>
|
|
|
|
|
<ul>
|
|
|
|
|
<li> If someone is to receive the message, the e-mail address <em>has</em>
|
|
|
|
|
to be in the recipient list. This is the only parameter that controls who
|
|
|
|
|
gets a copy of the message;
|
|
|
|
|
<li> If there are multiple recipients, none of them will automatically
|
|
|
|
|
know that someone else got that message. That is, the default behavior is
|
|
|
|
|
similar to the <tt>Bcc</tt> field of popular e-mail clients;
|
|
|
|
|
<li> It is up to you to add the <tt>To</tt> header with the list of primary
|
|
|
|
|
recipients so that other recipients can see it;
|
|
|
|
|
<li> It is also up to you to add the <tt>Cc</tt> header with the
|
|
|
|
|
list of additional recipients so that everyone else sees it;
|
|
|
|
|
<li> Adding a header <tt>Bcc</tt> is nonsense, 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
|
2011-05-25 22:57:22 +02:00
|
|
|
<a href="http://www.ietf.org/rfc/rfc2821.txt">RFC 2821</a>
|
2003-08-31 03:00:15 +02:00
|
|
|
and
|
2011-05-25 22:57:22 +02:00
|
|
|
<a href="http://www.ietf.org/rfc/rfc2822.txt">RFC 2822</a>.
|
2003-08-31 03:00:15 +02:00
|
|
|
</p>
|
|
|
|
|
|
|
|
|
|
<pre class=example>
|
2004-06-15 08:24:00 +02:00
|
|
|
-- load the smtp support
|
2005-02-08 11:01:01 +01:00
|
|
|
local smtp = require("socket.smtp")
|
2004-06-15 08:24:00 +02:00
|
|
|
|
2003-08-31 03:00:15 +02:00
|
|
|
-- Connects to server "localhost" and sends a message to users
|
2004-06-21 00:19:54 +02:00
|
|
|
-- "fulano@example.com", "beltrano@example.com",
|
|
|
|
|
-- and "sicrano@example.com".
|
2003-08-31 03:00:15 +02:00
|
|
|
-- Note that "fulano" is the primary recipient, "beltrano" receives a
|
|
|
|
|
-- carbon copy and neither of them knows that "sicrano" received a blind
|
|
|
|
|
-- carbon copy of the message.
|
2004-06-21 00:19:54 +02:00
|
|
|
from = "<luasocket@example.com>"
|
2003-08-31 03:00:15 +02:00
|
|
|
|
|
|
|
|
rcpt = {
|
2004-06-21 00:19:54 +02:00
|
|
|
"<fulano@example.com>",
|
|
|
|
|
"<beltrano@example.com>",
|
|
|
|
|
"<sicrano@example.com>"
|
2003-08-31 03:00:15 +02:00
|
|
|
}
|
|
|
|
|
|
2004-06-15 08:24:00 +02:00
|
|
|
mesgt = {
|
|
|
|
|
headers = {
|
2004-06-21 00:19:54 +02:00
|
|
|
to = "Fulano da Silva <fulano@example.com>",
|
|
|
|
|
cc = '"Beltrano F. Nunes" <beltrano@example.com>',
|
2004-06-15 08:24:00 +02:00
|
|
|
subject = "My first message"
|
2004-06-21 08:07:58 +02:00
|
|
|
},
|
2004-06-15 08:24:00 +02:00
|
|
|
body = "I hope this works. If it does, I can send you another 1000 copies."
|
|
|
|
|
}
|
2003-08-31 03:00:15 +02:00
|
|
|
|
2004-06-15 08:24:00 +02:00
|
|
|
r, e = smtp.send{
|
2003-08-31 03:00:15 +02:00
|
|
|
from = from,
|
|
|
|
|
rcpt = rcpt,
|
2004-06-15 08:24:00 +02:00
|
|
|
source = smtp.message(mesgt)
|
|
|
|
|
}
|
|
|
|
|
</pre>
|
|
|
|
|
|
2003-08-31 03:00:15 +02:00
|
|
|
<!-- footer +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
|
|
|
|
|
|
|
|
|
|
<div class=footer>
|
|
|
|
|
<hr>
|
|
|
|
|
<center>
|
|
|
|
|
<p class=bar>
|
2009-05-27 11:31:38 +02:00
|
|
|
<a href="index.html">home</a> ·
|
|
|
|
|
<a href="index.html#down">download</a> ·
|
2004-12-13 07:26:01 +01:00
|
|
|
<a href="installation.html">installation</a> ·
|
2003-08-31 03:00:15 +02:00
|
|
|
<a href="introduction.html">introduction</a> ·
|
|
|
|
|
<a href="reference.html">reference</a>
|
|
|
|
|
</p>
|
|
|
|
|
<p>
|
|
|
|
|
<small>
|
|
|
|
|
Last modified by Diego Nehab on <br>
|
2006-04-20 06:27:13 +02:00
|
|
|
Thu Apr 20 00:25:51 EDT 2006
|
2003-08-31 03:00:15 +02:00
|
|
|
</small>
|
|
|
|
|
</p>
|
|
|
|
|
</center>
|
|
|
|
|
</div>
|
|
|
|
|
|
|
|
|
|
</body>
|
|
|
|
|
</html>
|
