There are four main places in Mailman configuration for a list that can cause incoming messages to be held for moderation.
Moderated members
Non-members
Large messages
Implicit destination / Too many recipients
Moderated members
List members who are set to "mod" (which stands for "moderated", not "moderator") will have their postings held. You can see who has the mod box checked by going into Membership Management, and if you want to set them all to be unmoderated, you can do that...
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