Unopened emails - is there a way to find out if they are being delivered to the recipients' junk/spam folders?

Is there a way to find out if the unopened emails from an email broadcast ended up in the recipients’ junk folders?

Support can I believe track individual emails, however they wouldn’t be able to look up every email for you.

You might want to look into services provided by Adrian Savage et al on Free Email Health Check - DELIVERability I believe some of his tools an provide that level of detail for you.

All the best