sent an unsubscribed contact an email

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sent an unsubscribed contact an email

We had a triggered campaign with an incorrect filter criteria that allowed a large group of unsubcribed contacts to receive an email. The subscription status is help within our CRM and hasn't synced over to Marketo yet. Anyone have any best practices on dealing with the fallout? Should we confirm back to the contacts that the email was sent in error and that they won't see anything else or just let them be? Any suggestions are welcome as I didn't really see much to handle this particular scenario in the blogosphere.

Thanks! #subscribing#unsubscribe email#subscribing#opt-out#subscribing