The Moderated Subscribers-Only Discussion supports discussion forums where all posts are moderated. Because this List Type is moderated, it is less vulnerable to spam than the Closed Private Discussion or Moderated Private Discussion List Types so it can successfully serve a much larger subscriber base. It is suitable for any discussion forum where it is important to have posts filtered by a moderator. Moderation is the only way to be sure that inappropriate content is not posted to a mailing list, but it takes time and effort to moderate a list, so use this List Type when the benefit of preventing inappropriate posts justifies the costs. Because it rejects public posts, it is less open to public input than the Moderated Private Discussion List Type.

The Moderated Subscribers-Only Discussion uses the -mOuy combination to control posting access, so messages from subscribers and moderators are sent for moderation, but messages from public senders are rejected. This List Type uses the -u switch, so cross-posting is enabled, as are the Allow and Poster Subscriber Lists.

Although this is a private, rather than public, List Type, it can serve a larger number of subscribers than discussion forums that don't moderate subscriber posts. Like other private List Types, users can't subscribe via email so the subscription process is handled exclusively through webtools. The Web Availability setting for mailing lists based on this List Type can be set to 'Account Holders' if the list is open to any account holder or to 'Subscribers Only' if it is a closed, invitation-only list.

Archive access is somewhat dependent on the Web Availability setting, since a user has to be able to access the Mailing List Home page in order to see the link to the list archives.