You said to always cc the whole team on every email. So I did.
This happened at a marketing agency where I worked for about two years. We had a director, I'll call him Ron, who was very particular about communication and had a bit of a reputation for jumping into email threads late and then acting like he had no idea what was discussed, even when he was copied on everything. To combat this he made a new rule at a team meeting: everyone must cc the entire team on every email, no exceptions, so that nobody could ever claim they weren't informed about something.
I want to be clear that Ron meant this for client-facing updates and project decisions. That was obviously the spirit of what he was asking. But he said every email, no exceptions, and when someone asked if that included internal stuff he said yes, all of it, I want full visibility into everything.
So I complied. Fully. I cced the entire 14 person team on my email to IT asking them to fix my mouse. I cced everyone when I emailed the office manager to ask if we had more printer paper. I cced all 14 people when I followed up with a vendor about a invoice discrepancy for $40. I cced the whole team when I emailed Ron himself to let him know I'd be five minutes late back from lunch beacuse I was stuck in a slow elevator.
By day three Ron had received somewhere around 200 emails that had nothing to do with him. He pulled me aside and told me I was being ridiculous and that obviously he didn't mean personal admin emails. I pulled up the notes from the meeting on my laptop, showed him the part where someone asked about internal emails and he said all of it, and smiled politely. The rule was quietly revised to "project and client updates" by the end of that week.
I still cced him on the printer paper one for another month just to make sure he had full visability.