There's no question that in spite all the hours we spend dealing with it, email has made work easier. The ability to communicate with someone at your convenience, and have them reply at their convenience is - if it is used properly - a huge timesaver. But we start to stem this advantage this when poorly thought-out or poorly written emails are sent to large numbers of people, say, over 100. If 100 people spend 30 sec reading an email, then nearly an hour of productivity is lost. I'm not saying "never send out a mass email", I'm saying senders should be conscious of the time they are using and spend a few extra minutes making sure that the email has a descriptive subject line and is well-written. Well-written English can be read much faster and can be triaged appropriately, and a good subject line obviously helps with that as well.