Mystery of adding X500’s – What an amazing thing to know…!!!
This is something I learned this morning and thought I should share with my subscribers.
Users are receiving NDR while responding to old emails of Ron Mayers.
Delivery has failed to these recipients or distribution lists:
The recipient’s e-mail address was not found in the recipient’s e-mail system. Microsoft Exchange will not try to redeliver this message for you. Please check the e-mail address and try resending this message, or provide the following diagnostic text to your system administrator.
If you click on the name, the NDR will get resolved to:
EXCH is the Exchange Organization name
This behavior is caused because every internal message send/received in the orgn, will have the recipient info resolvable normally to the LegacyExchangeDN attribute. In this case, the user mailbox would have been recreated or the old LegacyExchangeDN value would have been changed to a different one.
We need to add a new X500 address to the user mailbox from Exchange Management Console. To do that, we need to first create it in the right format.
First step is to get rid of the _ and convert them to /
Now the tricky part:
Look closely and you see some numbers like +20, +28 etc… Wondering what they are?
+20 is a SPACE
+28 and +29 are ( and ) respectively
+2E is .
So the actual X500 address to be added will look like this:
/O=EXCH/OU=EXCHANGE ADMINISTRATIVE GROUP (28FHSDHJF23GHYED)/CN=RECIPIENTS/CN=RON.Mayers@contoso.com
I know it’s crazy but it is what it is…
Update – MuthuKumar did cover X500 here:
Exmerge and X500.. A story…: http://msexchangeguru.com/2010/02/26/exmerge-and-x500-a-story/
Keywords: Adding a new X500 address, Issue with X500 address, NDR while replying to old emails in exchange