[yardshop]

At our company, people use it when they send all-staff messages. The all-staff group address goes in the BCC and the person usually puts themself in the To address. This cuts down on the useless Reply All "thank you" and "me too" messages going back to all staff. There are other ways to prevent that, but this has been one of the few legitimate and above-board uses of BCC that I have come across.