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+<title>3.5 The Non-digest Options Category</title>
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+<b class="navlabel">Previous:</b> <a class="sectref" HREF="node18.html">3.4 The Membership Management</A>
+<b class="navlabel">Up:</b> <a class="sectref" HREF="node9.html">3 The List Configuration</A>
+<b class="navlabel">Next:</b> <a class="sectref" HREF="node20.html">3.6 The Digest Options</A>
+<br><hr>
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+
+<H2><A NAME="SECTION002350000000000000000">
+3.5 The Non-digest Options Category</A>
+</H2>
+
+<P>
+Mailman delivers messages to users via two modes. List members can
+elect to receive postings in bundles call <i>digests</i> one or a few
+times a day, or they can receive messages immediately whenever the
+message is posted to the list. This latter delivery mode is also
+called <i>non-digest delivery</i>. There are two administrative
+categories available for separately controlling digest and non-digest
+delivery. You can even disable one or the other forms of delivery
+(but not both).
+
+<P>
+Both kinds of delivery can have list-specific headers and footers
+added to them which can contain other useful information you want your
+list members to see. For example, you can include instructions for
+unsubscribing, or a url to the lists digest, or any other information.
+
+<P>
+Non-digest deliveries can also be <i>personalized</i> which means
+certain parts of the message can contain information tailored to the
+member receiving the message. For example, the <span class="mailheader">To:</span> header
+will contain the address of the member when deliveries are
+personalized. Footers and headers can contain personalized
+information as well, such as a link to the individual user's options
+page.
+
+<P>
+In addition, personalized messages will contain extra information that
+Mailman can use to unambiguously track bounces from members.
+Ordinarily, Mailman does some pattern recognition on bounce messages
+to determine list members whose addresses are no longer valid, but
+because of the vagaries of mail systems, and the countless forwards
+people can put in place, it's often the case that bounce messages
+don't contain any useful information in them. Personalized messages
+avoid this problem by encoding information in certain headers that
+unambiguously identify the recipient of a message. If that message
+bounces, Mailman will know exactly which member it was intended for.
+
+<P>
+Note that because personalization requires extra system resources, it
+must be enabled by the site administrator before you can choose it.
+
+<P>
+Here are the variables which control non-digest delivery:
+
+<P>
+<DL>
+<DT><STRONG>nondigestable</STRONG></DT>
+<DD>This option controls whether members can receive immediate
+ delivery or not. If not, they will be forced to receive messages
+ in digests. You can't disable non-digest delivery if digests are
+ already disabled.
+
+<P>
+</DD>
+<DT><STRONG>personalize</STRONG></DT>
+<DD>This option turns on message personalization.
+
+<P>
+</DD>
+<DT><STRONG>msg_header</STRONG></DT>
+<DD>This text box lets you enter information that will be included in
+ the header of every non-digest message sent through the
+ list.
+
+<P>
+See below for more information on what can go in the headers and
+ footers. If you leave this text box empty, no header will be
+ added.
+
+<P>
+</DD>
+<DT><STRONG>msg_footer</STRONG></DT>
+<DD>Just like with the header, you can add a footer to every message.
+ The same rules apply to footers as apply to headers.
+</DD>
+</DL>
+
+<P>
+Headers and footers can contain any text you want. For non-English
+lists, the headers and footers can contain any character in the
+character set of the list's preferred language. The headers and
+footers can also contain <i>substitution variables</i> which Mailman
+will fill in with information taken from the mailing list. These
+substitutions are in Python string interpolation format, where
+something like <code>%(list_name)s</code> is substituted with he name of
+the mailing list. Note that the trailing "<tt class="samp">s</tt>" is
+required<A NAME="tex2html4"
+ HREF="#foot281"><SUP>2</SUP></A>.
+
+<P>
+For example, a footer containing the following text:
+
+<P>
+<dl><dd><pre class="verbatim">
+This is the \%(list_name)s mailing list
+Description: \%(description)s
+</pre></dl>
+
+<P>
+might get attached to postings like so:
+
+<P>
+<dl><dd><pre class="verbatim">
+This is the Example mailing list
+Description: An example of Mailman mailing lists
+</pre></dl>
+
+<P>
+Here is the list of substitution variables available for your headers
+and footers:
+
+<P>
+<DL>
+<DT><STRONG>real_name</STRONG></DT>
+<DD>This is the value of the <code>real_name</code> configuration variable
+ in the General options category.
+
+<P>
+</DD>
+<DT><STRONG>list_name</STRONG></DT>
+<DD>This is the canonical name of the mailing list. In other words
+ it's the posting address of the list<A NAME="tex2html5"
+ HREF="#foot282"><SUP>3</SUP></A>.
+
+<P>
+</DD>
+<DT><STRONG>host_name</STRONG></DT>
+<DD>This is the domain name part of the email address for this list.
+
+<P>
+</DD>
+<DT><STRONG>web_page_url</STRONG></DT>
+<DD>This is the base url for contacting the list via the web. It can
+ be appended with <code>listinfo/%(list_name)s</code> to yield the
+ general list information page for the mailing list.
+
+<P>
+</DD>
+<DT><STRONG>description</STRONG></DT>
+<DD>The brief description of the mailing list.
+
+<P>
+</DD>
+<DT><STRONG>info</STRONG></DT>
+<DD>This is the full description of the mailing list.
+
+<P>
+</DD>
+<DT><STRONG>cgiext</STRONG></DT>
+<DD>This is the extension added to CGI scripts. It might be the empty
+ string, <code>.cgi</code>, or something else depending on how your site
+ is configured.
+</DD>
+</DL>
+
+<P>
+Note that <code>real_name</code>, <code>host_name</code>, <code>description</code>, and
+<code>info</code> substitution variables take their values from the list
+configuration variables of the same name.
+
+<P>
+When personalization is enabled, the following substitution variables
+are also available:
+
+<P>
+<DL>
+<DT><STRONG>user_address</STRONG></DT>
+<DD>The address of the recipient of the message, coerced to lower case.
+
+<P>
+</DD>
+<DT><STRONG>user_delivered_to</STRONG></DT>
+<DD>The case-preserved address that the user subscribed to the mailing
+ list with<A NAME="tex2html6"
+ HREF="#foot283"><SUP>4</SUP></A>.
+
+<P>
+</DD>
+<DT><STRONG>user_password</STRONG></DT>
+<DD>The user's password, in clear text.
+
+<P>
+</DD>
+<DT><STRONG>user_name</STRONG></DT>
+<DD>The user's full name.
+
+<P>
+</DD>
+<DT><STRONG>user_optionsurl</STRONG></DT>
+<DD>The url to the user's personal options page.
+</DD>
+</DL>
+
+<P>
+<BR><HR><H4>Footnotes</H4>
+<DL>
+<DT><A NAME="foot281">...
+required</A><A
+ HREF="node19.html#tex2html4"><SUP>2</SUP></A></DT>
+<DD>The site administrator can configure lists to use a
+simpler interpolation format, where <code>$list_name</code> or
+<code>${list_name}</code> would be substituted with the mailing list's
+name. Ask your site administrator if the've configured your list this
+way.
+
+</DD>
+<DT><A NAME="foot282">... list</A><A
+ HREF="node19.html#tex2html5"><SUP>3</SUP></A></DT>
+<DD>For backward
+ compatibility, the variable <code>_internal_name</code> is
+ equivalent.
+
+</DD>
+<DT><A NAME="foot283">... with</A><A
+ HREF="node19.html#tex2html6"><SUP>4</SUP></A></DT>
+<DD>Usually it makes no difference which of
+ <code>user_address</code> and <code>user_delivered_to</code> is used, but it's
+ important to remember that they can be different. When they're
+ different, Mailman always uses the lower case address as the key
+ to the member's subscription information, but it always delivers
+ messages to the case-preserved version.
+
+</DD>
+</DL>
+<DIV CLASS="navigation">
+<p><hr>
+<table align="center" width="100%" cellpadding="0" cellspacing="2">
+<tr>
+<td><A HREF="node18.html"><img src="../icons/previous.gif"
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+<td><A href="contents.html"><img src="../icons/contents.gif"
+ border="0" height="32"
+ alt="Contents" width="32"></A></td>
+<td><img src="../icons/blank.gif"
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+<td><img src="../icons/blank.gif"
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+<b class="navlabel">Previous:</b> <a class="sectref" HREF="node18.html">3.4 The Membership Management</A>
+<b class="navlabel">Up:</b> <a class="sectref" HREF="node9.html">3 The List Configuration</A>
+<b class="navlabel">Next:</b> <a class="sectref" HREF="node20.html">3.6 The Digest Options</A>
+<hr>
+<span class="release-info">Release 2.1, documentation updated on October 2, 2004.</span>
+</DIV>
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