ExactTarget Error: No results were received from the ExactTarget API

If you are working on extensive integration with ExactTarget from Dynamics CRM, then you might come accross this error message:

"Error during send processing." "ExactTarget.MSCRM4.BusinessLogic.Connector.ExactTargetSendException: No results were received from the ExactTarget API. Send status is unknown. ---> ExactTarget.MSCRM4.BusinessLogic.Connector.ExactTargetSendException: No results were received from the ExactTarget API. Send status is unknown.
at ExactTarget.MSCRM4.ConnectorService.v2.Sends.Crm4SendRequest.SendToExactTarget(Send send, Int32 recipientCount)
--- End of inner exception stack trace ---
at ExactTarget.MSCRM4.ConnectorService.v2.Sends.Crm4SendRequest.SendToExactTarget(Send send, Int32 recipientCount)
at ExactTarget.MSCRM4.ConnectorService.v2.Sends.Crm4SendRequest.Execute()
"

This error occures if you are creating an et_exacttargetjob (Exact Target Send) record by using a system user who is not an ExactTarget user. Make sure you are setting the owner attribute of the Exact Target Send record to the correct user.

It's just a short tip, but since by the time of posting this can't be found by any popular search engine, I'm sure that this will help you, or myself in the future.