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<H2><A NAME="SECTION0021120000000000000000"><!--x--></A><A NAME="sec:antispam"><!--z--></A>
<BR>
11.2 What does Mailman do to help protect me from unsolicited bulk email
(spam)?
</H2>
<P>
A technical list's archives may include answers to a range of
different questions. Often, the people who have posted these answers would
be happy to help someone who doesn't quite understand the answer, and don't
mind giving their address out for that purpose. But
although it would be wonderful if everyone could contact each other easily,
we also want to make sure that the list and list archives are not abused by
people who send spam.
<P>
To make a range of options available to list administrators, Mailman allows
a variety of configurations to help protect email addresses.
Many of these settings are optional to the list administrator, so your
particular list may be set up in different ways. List administrators
must walk a fine line between protecting subscribers and making it difficult
for people to get in touch.
<P>
<UL>
<LI>Subscriber lists
<UL>
<LI>The list administrator can choose to have the subscriber list
public, viewable only to list members, or viewable only to list
administrators.
</LI>
<LI>The subscriber list is shown with the addresses obscured to
make it difficult for spam harvesters to collect your address.
</LI>
<LI>You can choose to have your address hidden from the subscriber
list. (See Section <A HREF="node37.html#sec:nolist">10.4</A> for more information.)
</LI>
<LI><span class="note"><b class="label">Note:</b>
The entire subscriber list is always available to the
list administrators.</span>
</LI>
</UL>
<P>
</LI>
<LI>List archives
<UL>
<LI>The list administrator can choose for the archives to be public,
viewable only to members (private), or completely unavailable.
</LI>
<LI>The HTML archives which are created by Pipermail (the
archiving program which comes default with Mailman) contain only
obscured addresses. Other archiving programs are available and can
do different levels of obfuscation to make addresses less readable.
</LI>
<LI>If you wish to be more sure, you can set the mail header
``<span class="mailheader">X-No-archive:</span> yes'' and Mailman will not archive your
posts. Similarly, you can set the mail header
``<span class="mailheader">X-Archive:</span> no'' to disable archiving.
<P>
<span class="warning"><b class="label">Warning:</b>
This does not stop other members from quoting your posts,
possibly even including your email address.</span>
</LI>
</UL>
<P>
</LI>
<LI>Limited posting to the lists
<UL>
<LI>The list administrator can choose who can post to the list.
Most lists are either moderated (a moderator or administrator
reviews each posting), set so only subscribers may post to the list,
or allow anyone to post to the list.
</LI>
<LI>By allowing only subscribers to post to a list, Mailman often
blocks all spam and some viruses from being sent through the list.
As such, this is a fairly common setting used by list administrators.
</LI>
</UL>
<P>
</LI>
<LI>Anonymous lists
<UL>
<LI>Lists can also be made fully anonymous: all identifying
information about the sender is stripped from the header before the
message is sent on.
</LI>
<LI>This is not typically used for anti-spam measures (it has
other uses), but it could be used in that way if desired.
</LI>
</UL>
</LI>
</UL>
<P>
Of course, many address-obscuring methods can be circumvented by determined
people, so be aware that the protections used may not be enough.
<P>
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<span class="release-info">Release 2.1, documentation updated on 7 October 2003.</span>
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