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Continue to ChatIf you're ever bcc'd, do not go near 'reply all.' 'Bcc' is 'blind carbon copy.' It means you're a fly on the wall, dude! If you hit reply all, it's beyond bad etiquette to out the person who gave you the superpower of invisibility. It's like screaming, 'I'm a spy!' - Faith Salie from https://whatsmyquote.com/quote/if-you-re-ever-bcc-d-do-not-go-near-reply-all-bcc-is-blind-carbon-copy-it-means-you-re-a-fly-on-the-wall-dude