In order to reduce spam, I have a policy that the very first comment that is submitted must be approved by me. Once approved, that commenter is free to comment without prior approval.
This means, however, that I must judge if the first comment is genuine or not. So people who are commenting for the first time should make sure that it is relevant to the post that they are commenting on and does not look like it could be misjudged to have been generated by a spambot.
I have had to turn down some comments because they were too generic. If yours was one that was turned down by mistake, I apologize and urge you to resubmit with the above in mind.