Hi all, We started to receive an error message from our exchange 2000 server saying the following: “Your message did not reach some or all of the intended recipients. Subject: 5:18 Sent: 27/02/2007 05:19 م The following recipient(s) cannot be reached: walid@xxxxxxxxxxx on 27/02/2007 05:19 م You do not have permission to send to this recipient. For assistance, contact your system administrator. <ourdomain.com #5.7.1 smtp;550 5.7.1 Unable to relay for walid@xxxxxxxxxxx>” If we restart the servers it work for period of time and return display the same error. Finally we used a smart host to relay the message, one of the servers forwarded its messages to the smart host while the other server return the same error again. Please help. Ashraf ----------------------------------------- This E-Mail is confidential. It may also be legally privileged. If you are not the addressee you may not copy, forward, disclose or use any part of it. If you have received this message in error, please delete it and all copies from your system and notify the sender immediately by return E-mail. Internet communications cannot be guaranteed to be timely secure, error or virus-free. The sender does not accept liability for any errors or omissions.