Modified on: Wed, 20 Mar, 2019 at 6:55 AM
Yes, when you upload your new file any contacts that already exist on the list and any contacts that are opted-out will automatically be omitted from the import.
List Management > List Management FAQ
Modified on: Wed, 20 Mar, 2019 at 6:55 AM
Yes, when you upload your new file any contacts that already exist on the list and any contacts that are opted-out will automatically be omitted from the import.