how do leads with a value of mktUnknown get created? We have a number of leads in our database with mktUnknown as the last name.
Candace,
People with "mktUnknown" as the last name were created through the Email add-in plugin through Outlook or Gmail. When a person is emailed using the plugin that is not in your database, a lead is created for them.
More info: Send and Track an Email with the Email Add-In for Outlook - Marketo Docs - Product Docs
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