All the posts we have received from you have been published, so I'm not sure what happened to the post you refer to. We do email users if their posts have to be edited before publication or are unable to publish their posts, on every occasion. We do understand the emotional investment that all our members have in the forums, and do our best to try and keep people happy.
When threads are moved, we advise the member who posted the original topic by email that this has occurred. It would not be practical for us to message all contributors to threads that we need to move. As you have discovered, you can always keep track of your posts via the "My posts" tab. We do ask members as part of our community rules to choose the most appropriate section for their posts.
Future upgrades to the forums will allow members to subscribe to threads that they are interested in, and send email updates when new replies come in. We expect this to be up and running before the end of the year, resources permitting.
Thanks for your feedback about the tabs between All posts/My posts/New posts. We'll take this into account when planning future upgrades.