Originally Posted by Redcoder
But its not very essential. Codingforums doesn't have this feature...yet its okay to me. But if your site is message based, it would not be overkill to have a draft feature.
This actually isn't true, we actually do have this feature at least at the posting level (and presumably at the PM level as well since its logic flow if very similar). It just makes no indication of such.
If you let your session time out while authoring a post, it will send you to the login page (with no notification that it will forward the post :/). After logging in again, it will submit the post. I remember testing this a few months ago and I was surprised to find that it would submit the post after.