Forum extension documentation

[gelias]

I would like to know where I might obtain more thorough documentation/info on the Forum module, if available. Ex. problem: email notifications for new posts/replies are no longer going out -- just stopped??! We think it had to do with a domain name change - post notifications to subscribers apparently quit going out about the same time as the domain name was changed.

Exactly what is possible with forum/topic notifications? Etc.

Thank you.