Some Users are getting Delivery has failed to these recipients when they email a exchnage user.

Posted on 2012-08-24
Last Modified: 2012-10-24
I have a users where some of the company can no longer email this person.

We are using a SBS 2011 and I did a migration, however after the migration some of the users are not able to email this person anymore. The Old SBS 2003 Server has been retired and Exhcange was removed and the server was demoted.

Can anyone maybe tell me why they are getting this? And more important how to correct this issue?
pharris & prquiza are the same users, Just so you know.
Delivery has failed to these recipients

Pat Urquiza<>
The e-mail address you entered couldn't be found. Please check the recipient's e-mail address and try to resend the message. If the problem continues, please contact your helpdesk.

Diagnostic information for administrators:

Generating server: JUDY.DOMAIN.local
#550 5.1.1 RESOLVER.ADR.ExRecipNotFound; not found ##
Question by:sdetraff
    LVL 52

    Expert Comment

    We are using a SBS 2011 and I did a migration, however after the migration some of the users are not able to email this person anymore. - Assume there was a PST Export and Import .... does this user has a X500 ? Possibly the issue

    If not Add X500 to users email address and check

    - Rancy
    LVL 18

    Accepted Solution

    X500 I don't believe will be your issue, as the SBS2003 server is gone from the network and the migration was done not using export/import - I don't believe?

    Although this link may be of help:

    If it's just one user, export the mailbox, delete and recreate again, import. Much quicker than fiddling around.
    LVL 74

    Expert Comment

    by:Jeffrey Kane - TechSoEasy
    The problem occurs often.  It happens because of old email addresses stored in a user's NK2 file (the auto-fill items for the "TO" field in Outlook).

    The only way to really stop it from happening is to get users to recognize that it is autofilling the wrong address and to DELETE that from the drop-down choices when they start typing a user's name.

    Usually its only a few people who are affected so it should be too hard to get rid of them.

    If you have more, AND you are using Outlook 2010, you can import the NK2 file into the Suggested Contacts list (which has now replaced NK2) and then manually delete any incorrect addresses.  (


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