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Interesting error message with content organiser: Cannot resolve mailbox (null) to a valid user

Posted By:      Posted Date: September 01, 2010    Points: 0   Category :SharePoint
Here is a site with content organiser site feature enabled, as well as the email integration feature. Emails are successfully delivered to the "Submitted Email Records" list, but is never routed to the Drop Off Library. (the content organiser web service works fine and the drop off library works as a custom send to destination and happily processes its rules. If I turn up the debug juice I get the error "Cannot resolve mailbox (null) to a valid user" for every item in any "Submitted Email Records" in the site collection. Area: Document managagement Category: Content organiser EventID: 8000 Message: Cannot resolve mailbox (null) to a valid user I have temporarily worked around the problem by email enabling the drop off library but it creates an intermittent race condition (similar to certain workflow and event receiver situations), so its not a real solution (and in fact I assume thats why the Submitted Email Records hidden list exists in the first place). I've run procmon, specifically focusing on OSWTIMER and nothing interesting shows up at all. The error message is intriguing and I can't really think of what it is trying to do. In troubleshooting I noted that this farm had configured inbound email but not outbound email. I have since rectified this and de/reactivated the content organiser features and reset the timer service and IIS, b

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