As of Friday last week we have been experiencing duplicate emails being sent despite there being only 1 email action in the workflow. The workflow is only running once (we have checked Workflow History).
We are using External sending. The email step is taking a long time to process (4 minutes) and sends multiple copes. A "Log Workflow History" before and after this step shows that the step itself only runs once.
When we switch to Internal sending the email step runs in less than a minute (likley seconds) and only 1 email is sent.
Is there an email issue on the Nintex side when external sending is being used?