They used to allow changing email addresses on PC Graal, where you'd have to contact an Accounts person. They stopped doing it around I think 2008 not long before iGraal. I don't really know why, but the way they were doing it before I don't expect would be scalable to the present userbase of iGraal. You would have to ask Stephane what his reasoning is I'd imagine. I guess one way to handle the problem is to contract out to another company and hold them responsible for any identity-related liability.