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When you send an email to someone but also send it to everyone who can yell at you if things go wrong just to show off how much you know what's going on.
I'm telling you the client was wrong, and I CC'd my boss, my manager, and my mom.
He messed up the report, so I sent it to him and the whole department.
She forgot to send the file, so I emailed her and my boss, my boss's boss, and the janitor.