One of my clients is using Windows SBS 2003 with Exchange and AD enabled. Everything works fine except one annoying detail. Each time an IMAP or SMTP authentication is being make a username followed by @domain.local is needed to be used for the authentication to succeed. XP workstations authenticate via username only. It is just email related authentications. Any ideas how to change authentication so that only the username is being used? Is it because I have used .local in the domain instead of .com or something?