When I read statements that Mail-Art after the 90-ies didn't change I always get comfused. Didn't a new communication form enter the playing field of the Mail-Artists and weren't they acting towards the influences of e-mails and websites.
Nowadays these are all integrated as I notice on things like the IUOMA ning site. Mail-Art changes all the time until there is no communication between people anymore. That won't happen.