Except the first one the others 2 mean that those people unsubscribe and Eloqua will stop them automatically.
I have a lot of these returns Excluded from email: return.
I wanted to understand what caused this status.
Excluded from email : return
It had 2 types,
Soft bounce - which is temprory issues with mail server from the sender or receiver end. but later eloqua retries by default to deliver the email.
Hard bounce - Invalid email ID's which we can't reach at all.
Thanks for the feedback