I've added a RSS feed to the Forum (see little icon in the upper right). Some may be familiar with what this is, but if you aren't, read on.
RSS feeds are a unobtursive way for users to recieve the latest updates to the forum. You need to use special software to read a RSS feed, but those can be found by clicking on the 'About RSS' link at the top of the page next to the RSS icon and locating a reader compatible with your computer operating system. I've been using FeedReader on my Windows laptop and that works well, if you're looking for a recommendation (it's freeware, too).
One could use this feed as an alternative to getting emails of all the forum posts. It doesn't update exactly in real time, but you can configure your reader to update as often as every five minutes (for FeedReader, at least), which is probably often enough.
Try it and let em know if you find problems.