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Event ID: 1901 Source: MSExchangeOMA

User <user name> does not have a valid mailbox that ends with the SMTP proxy address <proxy address>. Please make sure that the correct SMTP proxy address is set on the Outlook(R) Mobile Access virtual directory in Internet Information Services.
This issue can occur if the user does not have the same email address with the OMA default SMTP domain name. See ME555523 to solve this problem.
Make sure the user has a SMTP address with a suffix that matches the domain listed in the Default Recipient Policy in Exchange.
As per Microsoft: "This occurs if the user has an invalid e-mail address. Check that the user e-mail address is correct". See MSEX2K3DB for information on this event.

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