On a Contact/Lead/Person Account object there is an "EmailBouncedReason" field along with an "IsEmailBounced" field, which makes it possible to understand a cause and fix it.
But on the EmailMessage object, there is only "IsEmailBounced" without the "EmailBouncedReason". When the email is sent, let's say, from an Opportunity to an address, not associated with Contact/Lead/Person Account, I only see an icon in the activity tab and can't understand the reason for the bounce.
Maybe I'm missing something and there is a way to find out the reason in that case?