This forum uses Akismet to deter spam, and sometimes it detects false positives – marking legit posts as spam. This is usually due to the links contained in the post. So if this happens again, try removing any links in the post, and then edit that post after you have submitted it to include those links.
It’s not a perfect system, I know, but without this protection we’ll be crushed by the sheer amount of spam forums such as this receive.