The only other thing I can think of is if the contact ended up unsubscribing / getting unsubscribed at some point in your contacts. I'd say if the issue occurs again, please call our general support line so they can securely look up the contact info and do some more investigating live with you. If you're unable to call in, I'd recommend saving the @OhioDVNetwork mention email you receive from this response. That way you can securely reply to it with the affected contact's information, and we can do some more investigating from our side.
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