"Another benefit of a sender filter is that it resets expectations. The most crucial line in my description is the following: "I'll only respond to those proposals that are a good match for my schedule and interests." This seems minor, but it makes a substantial difference in how my correspondents think about their messages to me. The default social convention surrounding e-mail is that unless you're famous, if someone sends you something, you owe him or her a response. For most, therefore, an inbox full of messages generates a major sense of obligation. By instead resetting your correspondents' expectations to the reality that you'll probably not respond, the experience is transformed. The inbox is now a collection of opportunities that you can glance at when you have the free time--seeking out those that make sense for you to engage. But the pile of unread messages no longer generates a sense of obligation. You could, if you wanted to, ignore them all, and nothing bad would happen. Psychologically, this can be freeing."