If Bob is included on 2 lists, ListA and ListB, and Bob is using the same email, like firstname.lastname@example.org, Bob will receive 1 email if you send a campaign to ListA and ListB at the same time. Our system will remove the duplicate email address from the send. The only caveat to this is that if that person Unsubscribes from an email you send them, then they will be removed from BOTH lists since unsubscribing is a global action.
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