Funny. After deleting the CN=Servers i get still an NDR back when I try to send a email to an email enabled Folder in Public Folder. I get something like this:
#550 5.2.0 STOREDRV.Deliver: The Microsoft Exchange Information Store service reported an error. The following information should help identify the cause of this error: "MapiExceptionNotFound:16.18969:B1000000, 17.27161:0000000054000000000000000000000000000000, 255.23226:00000000, 255.27962:44000000, 255.17082:BFF9FFFF, 0.25697:00000000, 4.21921:BFF9FFFF, 255.27962:FA000000, 255.1494:35000000, 255.26426:96000000, 4.18236:BFF9FFFF, 4.7974:BFF9FFFF, 255.1750:43000000, 0.26849:43000000, 255.21817:BFF9FFFF". ##