SQL SERVER 2005 Error Sending Emails with attachments using Report Services Portal

Hi,

Hi,
I have a problem when scheduling a report on my Reports Portal, when i try to get the email functionality to attach the report and send an emai.

I have no problem when i schedule the report to send the email and insert a link to the report however.

this is the error i recieve on the reports portal:
''Failure sending mail: The report server has encountered a configuration error. See the report server log files for more information.''

this is the error in my Logfiles:
16:45:04:: i INFO: Call to RenderFirst( '/Product Management/Marketing Emails' )
ReportingServicesService!library!e!06/16/2008-16:45:04:: e ERROR: Throwing Microsoft.ReportingServices.Diagnostics.Utilities.ServerConfigurationErrorException: The report server has encountered a configuration error. See the report server log files for more information., AuthzInitializeContextFromSid: Win32 error: 5; possible reason - service account doesn't have rights to check domain user SIDs.;
Info: Microsoft.ReportingServices.Diagnostics.Utilities.ServerConfigurationErrorException: The report server has encountered a configuration error. See the report server log files for more information.
ReportingServicesService!library!e!06/16/2008-16:45:04:: i INFO: Initializing EnableExecutionLogging to 'True'  as specified in Server system properties.
ReportingServicesService!emailextension!e!06/16/2008-16:45:04:: Error sending email. Microsoft.ReportingServices.Diagnostics.Utilities.RSException: The report server has encountered a configuration error. See the report server log files for more information. ---> Microsoft.ReportingServices.Diagnostics.Utilities.ServerConfigurationErrorException: The report server has encountered a configuration error. See the report server log files for more information.
   at Microsoft.ReportingServices.Authorization.Native.GetAuthzContextForUser(IntPtr userSid)
   at Microsoft.ReportingServices.Authorization.Native.IsAdmin(String userName)
   at Microsoft.ReportingServices.Authorization.WindowsAuthorization.IsAdmin(String userName, IntPtr userToken)
   at Microsoft.ReportingServices.Authorization.WindowsAuthorization.CheckAccess(String userName, IntPtr userToken, Byte[] secDesc, ReportOperation requiredOperation)
   at Microsoft.ReportingServices.Libra''

I know its saying i don't have admin rights but i can't understand how this is as i am using my admin rights , can someone advise me with this please.

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