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<h3><a name="SECTION002271000000000000000">
2.7.1 Subscription rules</a>
</h3>

<p>
This subcategory controls the rules for exposing the existance of this
list, and for what new members must do in order to subscribe to the
list.

<p>
<dl>
<dt><strong>advertised</strong></dt>
<dd>This option controls whether this list will show up in the list
    overview for the site.  Normally, an overview contains the name
    and short description of every mailing list in the virtual
    domain.  By setting this variable to <em>No</em>, it will not show
    up in this overview, nor will it show up in the administrative
    overview.  The only way then to find the list is to guess (or
    know!) its name.

<p>
</dd>
<dt><strong>subscribe_policy</strong></dt>
<dd>This option controls the steps that a new member must take to join
    the list.  The available options may differ based on some defaults
    that the site administrator chooses.  They are:

<p>

<ul>
<li>None - No verification is done on the subscribing
          member. This is also called <em>open subscriptions</em> and is
          generally disabled by default.  The site administrator must
          allow list admins to choose this option; if not, this option
          will not be presented to you.

<p>
</li>
<li>Confirm - An email confirmation step is required before the
          address is added to the list.  When a member requests
          subscription, either via the web page or by sending a
          message to <var>yourlist</var><code>-join@example.com</code>, Mailman
          will send a confirmation message to the requesting address.
          This mail-back confirmation contains a unique identifier,
          which the requester can present to Mailman in order to
          confirm their subscription.  This can be done either by
          replying to the mail-back, or by visiting the url in the
          mail-back message.  The url points to a page that lets the
          user either discard or confirm their request.

<p>
</li>
<li>Require approval - All subscription requests are held for
          approval of the list moderator.  No mail-back confirmation
          is sent, but the list admins will recieve a message
          indicating that approval is pending.

<p>
</li>
<li>Confirm and approve - Here, a mail-back notice must first
          be confirmed by the requester.  Once confirmed, the list
          moderator must then approve the request.  This is the most
          secure method for users to subscribe since it both verifies
          the requesting address, and forces the list moderators to
          approve the request.

<p>
</li>
</ul>

<p>
</dd>
<dt><strong>unsubscribe_policy</strong></dt>
<dd>Specifies whether the list moderator's approval is required for
    unsubscription requests.  <em>No</em> is highly recommended, since
    it is exceedingly impolite to not allow people to leave a mailing
    list whenever they want (i.e. opt-out).  <em>Yes</em> is useful in
    some specialized contexts; e.g. you may not want to allow
    employees to unsubscribe from the company newsletter.

<p>
</dd>
<dt><strong>ban_list</strong></dt>
<dd>This contains a list of addresses (or regular expressiosn), one
    per line, that are banned from ever subscribing to your mailing
    list.  If a match occurs during the subscription process, the
    request will be automatically rejected, and the requester will get
    a rejection notice.  You can use this to permanently ban
    troublesome posters to a members-only list.

<p>
</dd>
<dt><strong>private_roster</strong></dt>
<dd>This specifies who is allowed to view the roster of member
    addresses.  If you choose <em>Anyone</em>, then the list membership
    is completely public.  You can limit exposure of the roster to
    just list members, or just to the list administrators.  In the
    former case, a user must enter a valid member's address and
    password before they can view the roster.  In the latter case, a
    list administrator's password must be enter; if a matching admin
    password is entered, address field is ignored.

<p>
</dd>
<dt><strong>obscure_addresses</strong></dt>
<dd>Controls whether some simple obfuscation of addresses is used when
    member addresses are included on web pages.  This should reduce
    the opportunity for email address harvesting by spammers, although
    it probably doesn't eliminate it.
</dd>
</dl>

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<span class="release-info">Release 2.1, documentation updated on December 14, 2009.</span>
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