FAO Parkman and others.

Users who repeatedly make inappropriate posts can be placed in the Moderated usergroup by a board administrator. This is not a ban. The user can still post, but the posts have to be checked by a moderator before they go live on the board. This will typically involve a delay from a few minutes to a few hours.

The status of any such measures, including full bans are usually reviewed after a suitable period of time, if the user requests it.