Thanks so much, Dennis, for your reply. I hope to make more use of the Marketo community and its wisdom. We'll be reaching out to Marketo support directly on this. The way we have Marketo set up to handle separate and distinct clients (partitions and purposeful duplicates) means, if I understand correctly, that there is no overarching list of durable unsubscribes. I think once we delete unsubscribes, there will be no Marketo memory of that status, making uploading any list of contacts problematic.
... View more