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Friday 28 November 2014

Exchange 2013 CU6 - Mail Enabled Public Folders reject emails externally with a NDR

Users who send emails to a Mail Enabled Public Folder see an NDR when emailing externally even though the folder is set to allow emails without authentication.

NDR after CU6

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When you send an email to the Mail Enabled Publci Folder post CU6 you will receive an NDR such as the above.

Exchange CU6 Update Notes

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The change to the security is explained in the Exchane 2013 CU6 Notes here

Add Anonymous Permissions

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To allow emails to be sent to the folder you can use the above Power Shell to enable Anonymous CreateItems permission on the folder.
Add-PublicFolderClientPermission "\Customer Feedback" -AccessRights CreateItems -User Anonymous