the /cleanrules option looks like that did the job i will find out more in the morning when the user starts sending out lots of meeting request . thanks for you response and guide on this issue thank you very much i will let the list know more in the morning ________________________________ From: exchangelist-bounce@xxxxxxxxxxxxx [mailto:exchangelist-bounce@xxxxxxxxxxxxx] On Behalf Of James Chong Sent: Thursday, February 07, 2008 9:43 AM To: exchangelist@xxxxxxxxxxxxx Subject: [ExchangeList] Re: meeting request Try: 1. Outlook.exe/cleanrules (make a copy of the rule) 2. Accepting or denying a meeting request causes a "5.1.1" non-delivery report in Exchange Server http://support.microsoft.com/kb/312433 3. Make sure you are up to date on your Exchange patches; it will not correct your current issue; but prevent further ones I believe. Members of your organization may receive a non-delivery report if your delegate's mailbox object is removed from Active Directory before you can remove the delegate in Outlook 2003 http://support.microsoft.com/kb/909638 From: exchangelist-bounce@xxxxxxxxxxxxx [mailto:exchangelist-bounce@xxxxxxxxxxxxx] On Behalf Of Alex Sent: Thursday, February 07, 2008 10:06 AM To: exchangelist@xxxxxxxxxxxxx Subject: [ExchangeList] meeting request i have a user that when requesting a meeting and the other side responds the other side get a ndr about a user that no longer is avalible in the company this only happens on meeting request from this user i can not find were this problem maybe thanks