If the board is being specifically targetted then moving domain is unlikely to be anything but a temporary solution. Indeed, it may even encourage the attacker since he has won some kind of "victory" in forcing you to retreat.

On the matter of communication with board regulars, I'd suggest that an appeal be put out for posters who wish to be informed of site problems and changes to lodge an up-to-date e-mail address with the board moderators. That way a simple update e-mail can be sent to a group and people can be reasonably assured that their data will bb treated confidentially. Those who don't want to reveal such informationor who aren't interested in such updates can make that choice, of course.

I'd also suggest that once that list is created that any future discussion on anti-hacker measures is confined to that list. Hackers can read.

HH