Login >> Survey >> Send >> Lists
Now you will see all the email lists you have created. You will also be able to see how many email addresses are Active, Unsubscribed or Bounced.
You can use the feature Data Sync to update a huge list at once.
You can follow the same above process. When you edit the email address, you will find an option “Status”. You can select the value you want and then update the contact.
This feature is available with the following licenses :