The Moderated Subscriber-Only Discussion default List Type is the best choice for large private discussion lists like this one. Because the list is meant to serve everyone who belongs to the organization, Web Availability and Web Archive Visibility is set to 'Account Holder'. The Policy and Usage statement invites everyone to post news that is of general interest to the organization but notes that messages can only include small graphics, that attachments and solicitations are unwelcome, and all messages are subject to moderator approval. To keep the mailing list light weight, the maximum message size could be set to 1 MB.

The public cannot subscribe via ezmlm email commands and public posts are rejected, so there is minimal public contribution to this list, but exceptions may be made for people who are closely allied with the organization. For example, someone outside the organization who regularly publishes announcements that are of interest to the organization might be added to the Allow list by administrators.

Since this list is moderated and has so many subscribers, it isn't used to distribute any sensitive content, so administrators might also add some public subscribers to the Regular or Digest Subscriber Lists. These subscribers might be key contacts in related organizations, trusted news or public relations people, etc.

Every account holder can subscribe and once subscribed, can submit messages for moderation. Subscribers who abuse their posting privileges can be added to the Deny Subscriber List so that future posts are automatically rejected.

People within the organization who don't want to subscribe but need to be able to post can be added to the Allow Subscriber List. It would be good to give all existing groups cross-poster privileges for this mailing list, since cross-poster submissions are still subject to moderator approval.

As noted in the Concepts documents on moderation, mailing lists can have two kinds of moderators. The Organization Admin can moderate a mailing list through webtools and ezmlm email moderation commands, whereas moderators who are not website administrators can moderate a mailing list through ezmlm email commands. Since this list is likely to receive a large number of submissions, it would be best to have several moderators besides the Organization Admin. These moderators could handle most of the moderation tasks but would need the Organization Admin to add or remove subscribers from the Allow and Deny Subscriber Lists. Moderators can approve their own submissions, so anyone who has reason to post regularly to this mailing list would be a good choice for moderator.

The Announce Only default List Type is designed to distribute formal announcements from a small number of posters. The list is mandatory for all board members, so Web Availability is set to 'Administrator Only'. Board members do need to be able to see the archives, though so Web Archive Visibility is set to 'List Subscriber'. Because there are a small number of subscribers and the list may be used to distribute large documents, the maximum message size could be set to 50 MB if desired.

Mailing lists based on the 'Announce Only' List Type only accept messages from moderators, so there is no way to accept input from the inside or outside the organization who has not been designated as a moderator. If information from outside the organization or general organization membership needs to be funneled to the board, it's more likely to go through a member-moderator or administrator-moderator.

Board members may be passive recipients of this information, on the list as regular subscribers rather than moderators. Board members who want to post a message can simply send the message to a moderator who can forward it to the mailing list.

On mailing lists where only moderators can post, the moderators are the posters, and anyone who needs to post to this list regularly must be added as a moderator. Unlike mailing lists where a moderator's primary duty is to moderate messages submitted by others, there may be as many moderators on this kind of list as there are subscribers.

This mailing list uses a customized clone of the Newsletter default List Type that has been edited so that ezmlm email archive retrieval commands will be rejected. Anyone can subscribe via ezmlm email subscription commands, and a link that pops up an email client window is available in the Public Area of the website, but Web Archive Visibility is set to 'Account Holder', so you have to be able to login to view the Web archives. The Policy and Usage statement invites everyone to join the organization. The trailer text may be edited so that each list message reiterates this policy.

Anyone can subscribe via ezmlm email commands but only moderators can post, so subscribers are passive consumers of information published through this list.

Moderators act as posters on this list. The person responsible for creating the newsletter may be the only moderator on this list, or the newsletter may be a team effort with each member of the team subscribed as a moderator.