Adding New Lists to Existing List

Question

When leads are added to an existing list, does it make more sense to update the entire list by uploading both the old and new leads or import a new list of only the new leads? Will Marketo automatically  remove the duplicates (old leads) if I upload the new list in it's entirety? Which way is recommended?

Josh_Hill13 · Accepted Answer

Are you importing lead with a CSV file? Marketo will dedupe automatically by email address.

If you are adding leads to an existing static list (in any way), Marketo will just add new leads to the list. if the lead is already a member, it will be ok. It will not overwrite the leads already in the list or push them out. It will just add the leads who are not already members.

Cecile_Maindron · Answer

Unlike some CRMs, thereis no duplicate (=same email address) within Marketo smartlist or list.So let's say you have created a list with leads that have registered to an event and there is a lead who registered twice in 2 separate batches, they will just show up once. In their activity logs you'll see thatthey havebeen added twice though.In your case, I load the full list. The only time I only load net new or existing is when I have an external list and I want Marketo to show me : how many of the leads within mylist are net new or how many of the leads within my list are already existing in my DB

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