mirror of
https://github.com/lunarmodules/luasocket.git
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229 lines
6.9 KiB
HTML
229 lines
6.9 KiB
HTML
<!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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<title>LuaSocket: Network support for the Lua language</title>
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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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<img border=0 alt="LuaSocket" src="luasocket.png">
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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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<a href="home.html">home</a> ·
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<a href="home.html#download">download</a> ·
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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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<p>
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The <tt>smtp.lua</tt> module provides functionality to send e-mail
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messages. The implementation conforms to the Simple Mail Transfer Protocol,
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<a href="http://www.cs.princeton.edu/~diego/rfc/rfc2821.txt">RFC 2821</a>.
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The other RFC of interest in this implementation is
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<a href="http://www.cs.princeton.edu/~diego/rfc/rfc2822.txt">RFC 2822</a>,
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which governs the Internet Message Format.
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</p>
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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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field-3-name = <i>field-3-value</i>,
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</tt></td></tr>
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<tr><td align=center><tt>
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...
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</tt></td></tr>
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<tr><td><tt>
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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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Field names are case insensitive (as specified by the standard) and all
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functions work with lowercase field names.
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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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<!-- mail +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
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<p class=name id=mail>
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socket.smtp.<b>mail{</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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body = <i>string</i>,<br>
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headers = <i>headers-table</i>,<br>
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server = <i>string</i><br>
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<b>}</b>
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</p>
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<p class=description>
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Sends a message to a recipient list.
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</p>
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<p class=parameters>
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<tt>Rcpt</tt> is a Lua table with one entry for each recipient, or a string
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in case there is just one recipient.
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The sender is given by the e-mail address <tt>from</tt>.
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The message is composed by the optional MIME Headers <tt>headers</tt>
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and text <tt>body</tt>. The message is sent using the server
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<tt>server</tt>.
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</p>
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<p class=return>
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If successful, the function returns 1. Otherwise, the function returns
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<tt>nil</tt> followed by an error message.
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</p>
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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
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destination address field headers, i.e., the '<tt>To</tt>', '<tt>Cc</tt>',
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and, more importantly, the '<tt>Bcc</tt>' headers. Do <em>not</em> add a
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'<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>
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Only recipients specified in the recipient list will receive a copy of the
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message. Each recipient of an SMTP mail message receives a copy of the
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message body along with the headers, and nothing more. The headers are
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considered as part of the message. The list of recipients is <em>not</em>
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part of the message.
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</p>
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<p class=note>
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<a href="http://www.cs.princeton.edu/~diego/rfc/rfc2822.txt">RFC 2822</a>
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has two <em>important and short</em> sections, "3.6.3. Destination address
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fields" and "5. Security considerations", explaining the proper
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use of these headers. Here is a summary of what it says:
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</p>
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<ul>
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<li> <tt>To</tt>: contains the address(es) of the primary recipient(s)
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of the message;
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<li> <tt>Cc</tt>: (where the "Cc" means "Carbon Copy" in the sense of
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making a copy on a typewriter using carbon paper) contains the
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addresses of others who are to receive the message, though the
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content of the message may not be directed at them;
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<li> <tt>Bcc</tt>: (where the "Bcc" means "Blind Carbon
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Copy") contains addresses of recipients of the message whose addresses are not to be revealed to other recipients of the message.
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</ul>
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<p class=note>
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The LuaSocket <tt>mail</tt> function does not interpret the headers you
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pass to, but it gives you full control over what is sent and to whom
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it is sent:
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</p>
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<ul>
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<li> If someone is to receive the message, the e-mail address <em>has</em>
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to be in the recipient list. This is the only parameter that controls who
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gets a copy of the message;
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<li> If there are multiple recipients, none of them will automatically
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know that someone else got that message. That is, the default behavior is
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similar to the <tt>Bcc</tt> field of popular e-mail clients;
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<li> It is up to you to add the <tt>To</tt> header with the list of primary
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recipients so that other recipients can see it;
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<li> It is also up to you to add the <tt>Cc</tt> header with the
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list of additional recipients so that everyone else sees it;
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<li> Adding a header <tt>Bcc</tt> is nonsense, unless it is
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empty. Otherwise, everyone receiving the message will see it and that is
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exactly what you <em>don't</em> want to happen!
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</ul>
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<p class=note>
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I hope this clarifies the issue. Otherwise, please refer to
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<a href="http://www.cs.princeton.edu/~diego/rfc/rfc2821.txt">RFC 2821</a>
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and
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<a href="http://www.cs.princeton.edu/~diego/rfc/rfc2822.txt">RFC 2822</a>.
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</p>
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<pre class=example>
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-- Connects to server "localhost" and sends a message to users
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-- "fulano@tecgraf.puc-rio.br", "beltrano@tecgraf.puc-rio.br",
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-- and "sicrano@tecgraf.puc-rio.br".
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-- Note that "fulano" is the primary recipient, "beltrano" receives a
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-- carbon copy and neither of them knows that "sicrano" received a blind
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-- carbon copy of the message.
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headers = {
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to = "fulano@tecgraf.puc-rio.br",
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cc = "beltrano@tecgraf.puc-rio.br",
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subject = "LuaSocket test message"
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}
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from = "luasocket@tecgraf.puc-rio.br"
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rcpt = {
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"fulano@tecgraf.puc-rio.br",
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"beltrano@tecgraf.puc-rio.br",
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"sicrano@tecgraf.puc-rio.br"
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}
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body = "This is a test message. Please ignore."
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server = "localhost"
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r, e = socket.smtp.mail{
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from = from,
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rcpt = rcpt,
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headers = headers,
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body = body,
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server = server
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}
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</pre>
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<!-- footer +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
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<div class=footer>
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<hr>
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<center>
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<p class=bar>
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<a href="home.html">home</a> ·
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<a href="home.html#down">download</a> ·
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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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<p>
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<small>
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Last modified by Diego Nehab on <br>
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Sat Aug 9 01:00:41 PDT 2003
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</small>
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</p>
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</center>
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</div>
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</body>
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</html>
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