Naor, in our Marketo the Last Name field is populated with mktUnknown, but in Salesforce we have a validation rule that will not allow the Last Name field to contain "Unknown" (and other common placeholders), so our Lead doesn't sync to Salesforce. I'm not sure that I want them to sync to Salesforce as sometimes the rep has already created a lead in Salesforce before sending the email, but it just hasn't synched with Marketo yet, and Im worried of duplicates being created and round-robin assigned to another rep in Salesforce. Also, the mktUnknown leads in Marketo have their Marketing Suspended field checked, and any more emails that the reps send to that email address via MSI in Salesforce will not be sent.