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How Do I Avoid Duplicate Lead Creation in this Circumstance...

Question asked by 30d8fa68165bc2f13651c85d0435bb031566161d on Aug 19, 2013
Latest reply on Aug 19, 2013 by Kimi Heskett
I have about 1000 leads in Marketo that were uploaded from a list import without email addresses.  If I then find some of these email addresses, let's say 500, how do I import this new list without creating duplicates in Marketo, since it matches on email address? (and  it's way too many to update these leads one by one)

Any feedback on how to import this without creating duplicates would be great -