Then there’s the other popular option: Reply to None. I am a supervisor at a call center: we are a distributor for medical supplies that go to nursing homes. I sent a request at work on Friday to ship an order UPS Next Day Saver. The warehouse viewed the order and closed it that morning, saying it would ship. Six hours pass. One of the warehouse ladies emailed me to tell me that Saver was not an option, and asked if it could ship Next Day Air. She copied her warehouse leader and the supervisor at our call center that normally stays until close.
I leave at 5: the email was sent at 5:30. I check email at 9pm to see this, and to see no freaking response from the supervisor on duty. I freaked out for a minute. Then I checked the order, and saw that the warehouse did go ahead and ship Next Day Air.