by all means, write letters. I was referring to his email. We all know that email is not just for registering an opinion with someone but is used heavily in daily life and work, especially in academia. I am careful to send emails only when I am either totally unconcerned with flooding the person's inbox (i.e. when they are my political enemy) or when it is urgent and needs to be read immediately in order to influence the course of events. Neither holds in this case I think.

thanks