Exchange: Error – recipient’s mail system unknown or invalid? But works with GAL!

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Microsoft Exchange
Hi all, Not long ago, I started getting some messages returned to me, when addressing to people I correspond with frequently. Exchange is saying that the mail system they belong to is unknown or invalid, yet we're all on the same Exchange 2003 Enterprise server. We all know how Outlook caches the names of people you send frequently to, so that you don't have to type in the whole name or email address, it just auto completes, right? Well, if I delete these auto complete entries, and then try again, the message goes through. Same if I choose the recipient from the GAL. It goes through fine. So, my question is simply "What's going on"? Anyone know why these autocomplete entries get out of date and no longer point to the mailbox? I hate having to run around and tell people to delete these, or work from the GAL, if they don't have to. Thanks, Mark ------------------------------------------------------ Your message did not reach some or all of the intended recipients. Subject: Test Sent: 10/06/2005 12:10 PM The following recipient(s) could not be reached: 'Name Removed' on 10/06/2005 12:10 PM The message could not be delivered because the recipient's destination email system is unknown or invalid. Please check the address and try again, or contact your system administrator to verify connectivity to the email system of the recipient. <TORCVB.COM #5.1.2>
ASKED: October 6, 2005  12:22 PM
UPDATED: October 6, 2005  8:27 PM

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Generally this will happen if the recipients mailbox is moved between stores or the address is modified.

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  • Onnigs
    Remove the recpient from your own personal contact folder, that takes precedence. It may be outdated.
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