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howto determine cause of email rejection: The following recipient(s) cannot be reached

I have a user on a SBS 2008 domain. The SBS server is running Exchange 2007. The user is running Outlook on a Windows 7 workstation. She gets the message shown below. Other people can send to this same destination address from their workstation AND this user can also send to this destination from her login on other workstations. So, this must have something to do with the Outlook configuration on her WIN7 workstations. Does anyone have any idea of what could be up, or where I could look to figure this out?

From: System Administrator
Sent: Friday, July 08, 2011 8:23 AM
Subject: Undeliverable: test


Your message did not reach some or all of the intended recipients.

      Subject:  test
      Sent:     7/8/2011 8:23 AM

The following recipient(s) cannot be reached:

      Jill.Nichols@mmoh.com on 7/8/2011 8:23 AM
            None of your e-mail accounts could send to this recipient.

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TheGeezer2010

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mrhamen

Have the user type out the email address in full and see if it works. Sounds to me like you have a saved address on the machine in question that is not formed correctly possibly if the first time they emailed this user they cut and pasted there email from somewhere. I would also check the users contacts on that machine and make sure that is not where the problem lies.
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Yes! When the user typed the full address it worked! So, what does that mean? The email in one of the user's address books is bad? Is the solution then to delete the bad address book entry and re-create it?
It means they have an address cached which has an incorrect LegacyExchangeDN. Once you type the full address in and it resolves correctly, this will then overwrite the cached entry so there is nothing more to do.
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Agree with MrHamen as this could be inadvertently picked.