At iDoneThis, we have several shared email inboxes (Helpscout is fantastic for this: http://helpscout.net http://helpscout.net). What ends up happening is that

At iDoneThis, we have several shared email inboxes (Helpscout is fantastic for this: http://helpscout.net http://helpscout.net). What ends up happening is that most of our emails are processed out of shared inboxes, which makes it easier to respond in batch (as Harj points out) while still showing responsiveness (because people batch at different times). We end up hardly using our personal company email addresses.