Hello, I have a little question. I set for a User in AD (this have an Exchange Server 2003 mailbox), the Send As right for an another user. After 1 hour is this right deleted. I have found this article: http://support.microsoft.com/kb/907434/en-us But the User is only a member of Domain Users. Does anyone know this problem?

Hello, is your user (or maybe the entire "Domain Users" group?) a member of an administrative group (like Domain Admins etc.)? If yes your user account falls under the "AdminSDHolder" which resets the user's permissions to a default level. You can find more information here: http://msmvps.com/blogs/ulfbsimonweidner/archive/2005/05/29/49659.aspx Greetings, Toni

THANK YOU!!! The Domian User are membrs of Print Operators :) I changed it and test in - I'll give feedback.

Thank you very much, after I removed the group from the group print operators group, now get the Send As rights. But I have now a new problem. The people get a NDR message, when he send from an another user? The people have the send as rights. NDR: You are not authorized to send to this recipient. Please contact the system administrator. Does anyone know this problem?

Solution: Problem was the Outlook Cache!