There are spam submissions in the SESC spam submission folder. The spam submissions stay in the submission folder and are not processed by SESC. The SESC console does not increase the Failed counter. This counter is displayed at the top of the SESC console.
SESC debug logs contain the following error message:
[::]2012-07-09 07:21:43,583, , ERROR, Symantec.Submission.Exchange.Client.ExchangeItem, Microsoft.Exchange.WebServices.Data.ServiceResponseException: The server to which the application is connected cannot impersonate the requested user due to insufficient permission.