Is there any way to tell if an email I was sent was also BCC'd to someone else?

Not necessarily who, but IF it was or not.

 

if you click on the sent email box, click on the specific email and it will show who it went to.

 

You can’t, that’s one of the main purposes of a blind carbon copy.

 

For CC you can, it'll include who it was sent to... BCC on the other hand is specifically blind nobody but the sender knows.

 

Not from the recipient's side.