I’ve been caught by the Akismet net a couple times as well when I’m making my first post to a forum. It’s quite unpleasant as a newcomer.
Another mitigating factor might be to not entirely hide your post after it’s been flagged by Akismet. Instead, use Discourse’s existing styling for trunkated…
or flagged posts:
And reuse the Akismet copy along with a linkified “View your hidden post”. That way you won’t have that uncomfortable “but where did it go!?”-feeling.