User [Server/Org Org] not found in Domino Directory

We have an agent (signed by the server) that when sending an email, will fail and this error is returned. Any ideas? Thanks in advance.

Subject: User [Server/Org Org] not found in Domino Directory

what are the agent properties?

Subject: RE: User [Server/Org Org] not found in Domino Directory

Shared - Action Menu Selection - Target = NoneRuntime Security level is set to 3. Allow restricted operations with full administration rights