How to organise emails that weren't delivered.

1. Click Marketing → Email Campaigns:
   
   
    
2. Click the email campaign you want to view
3. Click the Recipients tab and select Not delivered:
   
   

Click Email bounced to check details and click to:

1. Deactivate
   Sets the contact as inactive
2. Unbounce
   Removes the email address from the bounce list, so the contact is included in future email campaigns. This is available for hard bounces and for Previous bounce rows. Soft bounces have no Unbounce option.
   Each month you can unbounce up to 2% of the contacts in your account (1 if you have fewer than 50 contacts). The limit resets on the 1st of every month. When it is reached, Unbounce is greyed out and the tooltip reads "No more emails can be removed from the bounce list this month".