I am trying to locate a list of contacts that have unsubscribed from receiveing emails. Where would I find that? And how do I distinguish insubscribed from emails that have bounced?
For this you'd build active lists. Within those active lists, you can filter for "Opted out of email" properties.
For example, you'd be filtering for "Opted out of email marketing information" = "yes". These would not include bounced contacts. (If emails have bounced before, they haven't reached the recipient and he couldn't have been able to click the unsubscribe link at the end of those emails.)
To answer your second question, you could filter for "Email hard bounce reason" = "known".
Hope this helps!
Karsten Köhler HubSpot Freelancer | RevOps & CRM Consultant | Community Hall of Famer