"Batch Your Email (When people are unlikely to respond right away). Email is one of the biggest time wasters. Stay away unless it is absolutely critical to your previously set objectives. Remember that the more emails you send throughout the day, the more you receive. It's a vicious cycle."
"I batch emails at night or early in the morning when people are less likely to respond right away. It is amazing how fast you can blow through a few hundred emails when you are not replying to instant responses and can move on to other tasks."