Symptoms
Consider the following scenario:
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You migrate from Microsoft Exchange Server 2010 to Exchange Server 2013.
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You have a forwarding rule that was created by the Folder Assistant for a public folder.
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The forwarding rule uses the "Leave message intact" method.
In this scenario, if an email message is received from an external sender, the message is not forwarded.
Cause
This issue occurs because the Send-As permission is evaluated incorrectly.
Resolution
To resolve this issue, install Cumulative Update 13 for Exchange Server 2013 or a later cumulative update for Exchange Server 2013.
Status
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
References
Learn about the terminology that Microsoft uses to describe software updates.