New members with less than 5 posts sometimes get caught by the filter we use to keep the spammers at bay. Particularly if there's URL links, or the post is very long, the post might get caught by the filter.
As we usually go through on quick spam irradiaction sweeps, (and they are frequent and numerous) sometimes new users also get hit with a spam ban as individual posts are sometimes just given a quick glance.
So, two things:
If you have less than 5 posts and are told that you need to wait for mod approval, contact a mod via PM and let us know so that we can make sure to clear your post quickly, and make sure we don't accidentally ban your account on a sweep.
2, if we do accidentally ban for spam when you weren't actually doing that, again contact the mods and let us know.
Apologies for the inconvenience, but with spammers hitting this site with about 200-400 spam posts a week, we do still have our work cut out and spammers aren't given a second glance most of the time.