Most of us receive more than we could ever read, so start with unsubscribing. Yes, it's easier to simply delete, but if you'd like to avoid getting weekly or even daily marketing emails from that candle company you gave your email address to in order to save 10% on your only purchase, you've got to go to the source.
"The 'To' field is reserved for primary recipients, while CC and BCC provide options for including others discreetly. Everyone in the CC field can see each other's email addresses, which is not the case for BCC. This can help maintain professionalism and manage responses efficiently."