If you’re using an alternate login scheme for a WPMU install, for example, LDAP, you might not want your users to be able change their email addresses within WPMU. This is a quick plugin that hides the email field in the profile page for users, replacing it with a notice that they are not able to edit their email.
Site admins can still edit email addresses via the edit user page. Though our testing with the WPMU ldap tag indicates that their may be issues with email addresses that do not match the ldap email address.
Download the code here.