After exporting a mailbox content, deleting the users mailbox and importing all the content again I ran into the issue of internal email bouncing when any mail was sent to this user. I was kindly directed by The Geezer2010 to an article which addressed the same issue and I (think) I followed the instructions and it seemed to work ok but I am still experiencing some issues that have not settled yet.
I added the old (additional) x400 address to the mail properties of the user from whom I created the new mailbox, in AD but it doesn't seem to work for some users. Still getting NDR's. When I check from the affected user client pc, in outlook properties, email addresses, I can see that the additional x400 address is there. A couple of points I wanted to clear up.
1. The user got married some time ago and I changed the display name to her married name. So the original x400 address on the client pc's looked like this: x400:c=GB;a= ;p=mycompany;o=Exchange;s=Smith;g=Sue
When the new mailbox got created it created the new x400 entry as her married name in AD and there was no entry for the old one - I understand that this is the reason for the ndr's - the clients have the old address but the new mailbox had the new address associated .
2. When adding in the old x400 address to the email address properties of the new mailbox I went to fill in the boxes but noticed that the 'a' entry was blank in the original but the UI would not let me leave the 'a' box blank - I had to put something in. So I put 'mycompany' in twice effectively. Both the 'a' and'p' attributes are 'mycompany' Would this have any bearing on why a small number of users are getting NDR's?
The NDR: The 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. #5.5.1
Any more info much appreciated - Thanks