That's interesting Jon - can you give me some more info about what you did. I'm trying to work out if this is a substantial modification. Part of the trouble is that we mostly use LDAP authentication using the University's NDS system which in many (but not all at the moment) returns the student's University email address. However, they then go and change it to a Hotmail or Yahoo address which either doesn't work at all or is constantly full of spam.