I've got a RaQ3, all the patches are installed etc.
Every so often my sites lose the "email for domain". No mail is delivered and when I go to correct it by checking the box an error message states the "Email for Domain" is in use on another site, but the check stays in the box! Every is then OK 'till the next time.
This is happeng once or twice a week and I'm not sure why, no one has access to any of the GUI's.
I had to restore in august because of this and other problems but this one has come back.