this happens because you post too much in one day, and the time lag is in use too quickly.
Another cause is also because the post in publishing is considered by SPAM moderator. Wait 10 days ahead.
if you repeat the same error it may be banned permanently
If you excuse me, is there any restriction of posting daily or stuff? If I count it correctly then in the last 7 days I have posted more than 100 posts.... Just asking... is that a problem?
PS: I am not spam posting.
I don't think this is much of a problem if you are having real discussions and/or writting constructive posts. I remember seeing a user from the Coinroll sign campaign doing ~150 posts in a week (If I'm not mistaken) and his account looks ok so far.
I have also seen a few users from the same campaign I'm currently participating doing 100~150 posts in 1-2 specific weeks.