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<title>2.7.1 Subscription rules</title>
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<H3><A NAME="SECTION002271000000000000000">
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2.7.1 Subscription rules</A>
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This subcategory controls the rules for exposing the existance of this
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list, and for what new members must do in order to subscribe to the
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<DT><STRONG>advertised</STRONG></DT>
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<DD>This option controls whether this list will show up in the list
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overview for the site. Normally, an overview contains the name
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and short description of every mailing list in the virtual
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domain. By setting this variable to <em>No</em>, it will not show
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up in this overview, nor will it show up in the administrative
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overview. The only way then to find the list is to guess (or
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<DT><STRONG>subscribe_policy</STRONG></DT>
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<DD>This option controls the steps that a new member must take to join
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the list. The available options may differ based on some defaults
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that the site administrator chooses. They are:
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<LI>None - No verification is done on the subscribing
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member. This is also called <em>open subscriptions</em> and is
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generally disabled by default. The site administrator must
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allow list admins to choose this option; if not, this option
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will not be presented to you.
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<LI>Confirm - An email confirmation step is required before the
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address is added to the list. When a member requests
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subscription, either via the web page or by sending a
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message to <var>yourlist</var><code>-join@example.com</code>, Mailman
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will send a confirmation message to the requesting address.
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This mail-back confirmation contains a unique identifier,
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which the requester can present to Mailman in order to
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confirm their subscription. This can be done either by
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replying to the mail-back, or by visiting the url in the
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mail-back message. The url points to a page that lets the
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user either discard or confirm their request.
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<LI>Require approval - All subscription requests are held for
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approval of the list moderator. No mail-back confirmation
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is sent, but the list admins will recieve a message
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indicating that approval is pending.
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<LI>Confirm and approve - Here, a mail-back notice must first
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be confirmed by the requester. Once confirmed, the list
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moderator must then approve the request. This is the most
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secure method for users to subscribe since it both verifies
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the requesting address, and forces the list moderators to
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<DT><STRONG>unsubscribe_policy</STRONG></DT>
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<DD>Specifies whether the list moderator's approval is required for
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unsubscription requests. <em>No</em> is highly recommended, since
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it is exceedingly impolite to not allow people to leave a mailing
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list whenever they want (i.e. opt-out). <em>Yes</em> is useful in
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some specialized contexts; e.g. you may not want to allow
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employees to unsubscribe from the company newsletter.
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<DT><STRONG>ban_list</STRONG></DT>
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<DD>This contains a list of addresses (or regular expressiosn), one
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per line, that are banned from ever subscribing to your mailing
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list. If a match occurs during the subscription process, the
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request will be automatically rejected, and the requester will get
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a rejection notice. You can use this to permanently ban
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troublesome posters to a members-only list.
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<DT><STRONG>private_roster</STRONG></DT>
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<DD>This specifies who is allowed to view the roster of member
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addresses. If you choose <em>Anyone</em>, then the list membership
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is completely public. You can limit exposure of the roster to
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just list members, or just to the list administrators. In the
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former case, a user must enter a valid member's address and
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password before they can view the roster. In the latter case, a
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list administrator's password must be enter; if a matching admin
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password is entered, address field is ignored.
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<DT><STRONG>obscure_addresses</STRONG></DT>
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<DD>Controls whether some simple obfuscation of addresses is used when
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member addresses are included on web pages. This should reduce
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the opportunity for email address harvesting by spammers, although
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it probably doesn't eliminate it.
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<span class="release-info">Release 2.1, documentation updated on December 13, 2004.</span>
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