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Event ID: 9031 Source: MSExchangeTransport

Mail could not be delivered to "<mailbox>" because the address points to a local site but there is no recipient in the site with that address.
There are a couple of possible scenarios that can cause this:
1. A Microsoft Outlook user has an entry for that Exchange Server mailbox in his Contacts, but it uses the old mailbox data because it hasn't been updated.
2. Someone is replying to an older email message in Exchange Server that contains the outdated mailbox information.
See the link to "Event ID 9031 issue when deleting Exchange Server mailboxes" for additional information about this issue.

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