There's no reason to do this if your Marketo never had these people anyway.
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Anonymous
December 7, 2015
This worked! Thanks so much for the suggestion.
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Anonymous
December 17, 2014
Yes, You can import them by email address only if you like to a designated list, then select all members, do a data value change and change unsubscribe to true. I would typically do this again and change the unsubscribe reason as well and note where the list came from and why the change.