HootSuite CEO Ryan Holmes uses a daily email auto responder even when he isn't on vacation. The idea is to set expectations and let people know that he has received their message, but that he probably won't be responding right away. In the email it also discourages senders from following up, but promises that he will get back to them at some point. The goal is to keep email from cutting down on work productivity and to encourage patience among those waiting for a response.