We have an environment where we have Exchange 2007 and 2010 co-existing together whilst we migrate users gradually.
All users moved to the exchange 2010 server (which has a public folder database replica on it) get an access denied bounceback when e-mailing a certain public folder.
The issue does not exist for users who's mailboxes exist on the 2007 server.
What I have determined is that there are no default permissions on the folder, only a permission for anonymous users exist that allow "create items".
My theory is this... is that for some reason, users on 2007 are allowed to send to it because anonymous are allowed to, where 2010 is more specific and whilst anonymous users can send messages to it, "default" users can't.
Is this this the case and if so, should correcting the default permissions to match the anonymous permissions fix this issue for mailboxes on the 2010 server.
#554 5.2.0 STOREDRV.Deliver.Exception:AccessDeniedException.MapiExceptionNotAuthorized; Failed to process message due to a permanent exception with message Cannot complete delivery-time processing.