Diagnosis
You attempted to delete the SMTP node. This is not possible. It is alsonot possible to create more SMTP nodes. The SMTP node only exists oncein the system.

System Response
The node is not deleted.

Procedure
If you do not want to use the SMTP node, deactivate the indicator 'Nodein use'. The node will then be deactivated and not used in the sendprocess.
You can reactivate the node at any time.