The Moderated Public Discussion supports public discussion forums where all posts are moderated. Because this List Type accepts public subscription requests, it may have a large number of subscribers. Since it is moderated, it is less vulnerable to spam than the Public Discussion List Type. Moderation is the only way to be sure that inappropriate content such as spam is not posted to a mailing list, but it takes time and effort to moderate a list, especially when there are large number of potential posters, so lists of this type can require multiple moderators.

It uses the -mOU combination in the ezmlm-make argument string, so lists of this type do not distinguish between the different subscriber levels and view all posts as public. So every post sent to the list is forwarded to the moderation queue unless the sender is on the Deny Subscriber List.

This is a public List Type, so it accepts email subscription commands from the public. Lists that accept public subscription requests and are the most common and basic List Types. Because these lists are public, they are likely to serve a large subscribership. Because the list is open to public subscription, it wouldn't do any good to use a restrictive Web Availability setting.

Even though this is a public List Type, only subscribers can retrieve archives via email. Web-based archives are usually only available to account holders, providing a built-in incentive to acquire an account.