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Marketo Unsubscribes & Importing Lists

Question asked by 9f1ca821c7be18389ac8516d319e0e595751674e on Oct 5, 2015
Latest reply on Oct 6, 2015 by Grégoire Michel

We recently deleted about 150k leads from our Marketo database as they are unsubscribed or very inactive. Does Marketo keep these contacts unsubscribed if we added them back in through a list upload? Is there a way to upload a list and not have it update any lead fields or add any new leads?