Any emails being sent as part of 'Forward to Friend' will create that user as a new lead (provided that the lead does not already exist in Marketo). When leads are created in Marketo via the 'Forward to Friend' feature, Marketo automatically unsubscribes the lead records in order to protect our global customers from anti-spam laws. This is because a lead being sent a forwarded email doesn't qualify as opting in to a mailing list and also prevents them from getting any other emails by accident.
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