UPDATE: I think that we have resolved this issue. Please let me know if you have any difficulty sending/receiving forum posts. Thank you for your patience as we worked to resolve this issue.
There is a problem with one of the services that helps Moodle run. It should run automatically, but is not. This service is responsible for making sure that News Forum and other forum posts are sent to user's email. I have been running the service manually at regular intervals to try to alleviate some of the issue. I am able to do so while I am here, but will not be able to after 4:30 pm each day or on weekends. Please keep this in mind when you are posting messages. I will be working to remedy this as quickly as possible. I appreciate your patience in the mean time. Please let me know if you have any questions.