Is it possible to change the configuration of the Forum to enable users to receive a copy of the posting, not just a message saying that someone posted a new message?
Like if I subscribe to a forum, then I´ll automatically receive all new messages posted in this forum.
You can, just changing the ProcessSubscriptions sub in inc_subscription to select T_MESSAGE (or R_MESSAGE where appropriate. You'd just need to make sure you get the correct one.
The reason I would suggest against this would be the traffic to your forum would decrease doing this....