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What are the reasons for Marketo creating a duplicate data record, if the unique identifier is the email address?

Question asked by a7fd6df34642a24fa0cc90f15fe1d5519a3d7edb on Sep 6, 2016
Latest reply on Sep 6, 2016 by 388eb61a566e458482c7468927b4e0b43d3db6a6

I have some duplicate email addresses within the database that have the same email. On occasion, there is no further information in any fields other than the email address. Each duplicate email address and it's own lead number, and it's own history.

 

All leads are uploaded to Marketo direct from CSV file.

 

Why then has Marketo created a new record for that email?

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