Hi, all. I have an NDR being sent to the user when he tries to forward mail from the mailbox of another user, to which he has full access. The NDR looks like this: Your message did not reach some or all of the intended recipients. Subject: Mail subject Sent: 9/14/2006 11:42 AM The following recipient(s) could not be reached: Internal Recipient on 9/14/2006 11:42 AM You do not have permission to send to this recipient. For assistance, contact your system administrator. MSEXCH:MSExchangeIS:/DC=com/DC=domain:EXCHANGE-SERVER User forwards mail as himself not on behalf of original owner of the message. In 50% of cases he can forward mail without any problems. But in 50% he gets such NDR. When I tracked this message in ESM, I've seen just two records: 9/14/2006 11:42 AM Report generated internally 9/14/2006 11:42 AM Report delivered to Sender So why is such happens and is it possible to fix it? Server: Exchange 2003 SP1 (Build 7226.6) installed on the cluster of two nodes. OS: Windows 2003 Enterprise on both nodes Thanks in advance