1.From the home dashboard, select Suppression Management from the side navigation bar
2. Click "Bounces"
3. Select the type of bounces you want to view or "All" if you wish to view all.
Hard Bounces- mailbox is completely unavailable, invalid email that you are sending to
Soft Bounces- service will try to send again, because mailbox is only temporarily unavailable, for example, the mailbox host’s server might be down at the time client tries to send