This is on a Server 2003 R2(SP2) with Exchange 2003 SP2We get the folowwing message:---------------To: "User-X" <User_X@default.COM>,"User-Z" <IMCEAEX-_O=NewYork_OU=default+2ECOM_CN=RECIPIENTS_CN=User-Z@default.COM>---------------This message I get when User-Y send a appoitment trough Outlook to User-X.Some how User-Z is attached to User-X but I can't find any e-mail adress from User-Z in Active Directory.Can somebody help me because I want to now where the problem is hidden.With kind regards.

This is a common problem. Looks like User X had User Z as delegates. Follow the steps mentioned in the Article http://clintboessen.blogspot.com/2009/09/exchange-2003-meeting-request-receiving.htmlVinod |CCNA|MCSE 2003 +Messaging|MCTS|ITIL V3|

First: thank you for your reply.Resolution (Hard Method)I followed the steps from the Article you had given me BUT there is no delegate rule that is configured onthe mailbox, that has thePR_RULE_PROVIDER property is Schedule+EMS Interface configured."What can I do more?

Does the symptom only happen for appointment? Which mailbox do you check? I assume thats user-x. Have you uncheck the cache mode in the outlook before launch MFCMAPI? Please move the mailbox of user-x from original store to another, which can clear up corrupted rules from mailbox James Luo TechNet Subscriber Support (http://technet.microsoft.com/en-us/subscriptions/ms788697.aspx) If you have any feedback on our support, please contact tngfb@microsoft.com

Did not receice your first notification.Yes correct, this symptom happens only with appoitments.That's correct, I did check the mailbox of user-x.I used the tool MFCMAPI on the Exchange Server and our clients do not use cache mode.I only have one mailbox store.What can I do more to solve this situation James?

The issue only happens to user-x? Is there any forwarding rule on the user-xs outlook, anything in the Delegate tab? Please create a new mailbox with same settings as user-z, add it as delegate in the user-xs mailbox and then unchecked the option Send meeting requests and responses only to my delegates, not to me. If the NDR not comes anymore, remove the user-z again James Luo TechNet Subscriber Support (http://technet.microsoft.com/en-us/subscriptions/ms788697.aspx) If you have any feedback on our support, please contact tngfb@microsoft.com

This only happens to user-X.I receive the undeliverable messages.The is no forwarding rule and no delagation rules in Outlook of user X.I recreated the user-z in Active Directory and configured the user-x's mailbox andunchecked the option"Send meeting.........."I just find out that when user-x sends appoitment toanother user then she gets the same message again:_________________User ZThe e-mail account does not exist at the organization this message was sent to. Check the e-mail address, or contact the recipient directly to find out the correct address.____________________

If its not a standard edition of exchange, you can create a new store to move the mailbox. So, the any corrupted rules can be cleared out If it is a standard edition, recreate the mailbox for user-x would be a workaroundJames Luo TechNet Subscriber Support (http://technet.microsoft.com/en-us/subscriptions/ms788697.aspx) If you have any feedback on our support, please contact tngfb@microsoft.com

Unfortunately it's a standard edition.I will recreate the mailbox of user-x.Work around:- exmerge create pst from user-x- trough AD, Exchange tasks, delete mailbox- create new mailbox- import pstIs this correct James?

Yes, it's rightJames Luo TechNet Subscriber Support (http://technet.microsoft.com/en-us/subscriptions/ms788697.aspx) If you have any feedback on our support, please contact tngfb@microsoft.com

How's the issue now?James Luo TechNet Subscriber Support (http://technet.microsoft.com/en-us/subscriptions/ms788697.aspx) If you have any feedback on our support, please contact tngfb@microsoft.com

unfortunately I did not have the time to resolve this issue.I hope I can solve this problem this week.