Currently when we sync a lead from Marketo into Salesforce, the lead is appended based on email address to a current contact record (if one exists). Instead, we would like the lead to remain a lead even if a contact record (with the same email address) exists. Any tips on how to implement?
Just assign the lead to a lead queue. It will force the creation of a new lead.
But this is really not a good idea. It will create a duplicate in the DB, which will scatter activities, cause targeting or personalization errors, split scoring on 2 entries and ultimately cause loss of business (since split score will prevent leads to become MQL / SQL)