DAU resident course Welcome emails will be sent 60 days prior to the course start date or 24 hours after you receive a reservation for a class starting in less than 60 days. A follow up reminder Welcome email will be sent 2 weeks prior to your class start date. If you have not received a Welcome email within these timeframes, please contact the DAU Help Desk directly at dauhelp@dau.mil or call 1-866-568-6924 (toll free), DSN 655-3459 or Commercial 703-805-3459.