With moderation enabled a message sent to the group appears in the administrator’s message list with a ‘Moderate’ tag. Members who can see the message archive will only see messages which have passed moderation.
An administrator can then view the message and choose to either Approve or Reject it. They can also choose to “Reject with Reason” which will send an email to the original sender of the message allowing the administrator to explain why the message was rejected.
Group administrators receive an email every time a message is held for moderation. The email contains all the messages awaiting moderation and snippets of the messages with links to either approve or reject them.