Questions regarding Email Marketing and can you see who unsubscribed?

Firstly latest campaign had a 35% failed delivery. It was sent to all subscribed 1298 emails and when checking my subscribers it says I have 1419 subscribers. Unsure why there is a difference???

Is there any way to see who the 65% successfully delivered emails are, who unsubscribed (does shopify automatically unsubscribe when requested)and who the other 35% undelivered emails are?

We previously used mailchimp and recently went through a huge list and deleted all the customers who had requested to be unsubscribed.

Our first campaign via shopify email was 60% successful and even after deleting numerous unsubscribe requests we still have a failed result on the campaign of $35%.

Any answers would be greatly appreciated