Note: The name “SmartConnector” will be changing to “Integration App” to more clearly establish that our pre-built Integration Apps are built on our flagship Integration Platform as a Service, integrator.io. Find out more about integrator.io.
For contacts, we use the email address as the primary key for linking contact records in Salesforce with contact records in NetSuite. Due to this, we restrict syncing of contacts that don't have the email field populated.
If you need the contact to sync, we recommend that you put a unique email address on the contact record to allow it to sync. Example: firstname.lastname@example.org