Event ID - 1901

Event Id1901
DescriptionUser <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.
Event InformationAccording to Microsoft:

This occurs if the user has an invalid e-mail address.
Check that the user e-mail address is correct.
Reference Linksuser has an invalid e-mail address

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