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E-mail Only Static Lists to Avoid Dups

Question asked by 2736 on Mar 20, 2013
Latest reply on Mar 20, 2013 by 2736
We have a list of older "legacy" data from trade shows that predates our Marketo subscription. We want to upload the list to Marketo but know that there is some overlap with data that is already in the our Lead Database.

Can someone please confirm that one way to avoid unnecessary duplication would be to upload ONLY the email addresses from the legacy list? If not, alternative suggestions are welcome.