An user recently found and interesting thing with our Alfresco 5.0a installation (integrated with our Active Directory servers for login). Normally one logs in with a simple username and all is well. However, occasionally we'll have users forget and use their e-mail address instead of simple username. Rather than reject them, it will allow them to login, but not give them their normal dashboard and permissions!
Is there a configuration change I could easily make to disallow this e-mail address based login completely to help avoid confusion?