If you visit your CONTACTS tab on the top navigation bar, you'll be able to sort your contacts by engagement score, valid, undeliverable, and unsubscribed. That list can be downloaded using the Export button shown below and imported back into any other database, if necessary.  Undeliverable emails are the emails that bounced back. 

If you are looking to download a single campaign's bounce, unsubscribe or spam list, you can do so on the "Recipients" page of the campaign setup.

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