Yes new members are all on a post approval system. It can be frustrating for new users to not have their posts appear instantly, but it does keep the spam down, and doesn't last that long.
The initial post approval removes itself at some point, so as long as you keep posting and they keep getting approved it will disappear in no time. It's automated so mods can't take you off the initial approval.
Mods can put you back on post moderation, if you don't follow the rules of the forum, these can last from 1 day to 30 days, although the latter would be an extreme case.