Methods and apparatus, including computer program products, for automated management and control of contact aliases. In general, in one aspect, the invention provides a computer implemented method for processing messages. The process includes maintaining rules of which a first rule specifies a first alias of a first sender to be used for messages sent from the first sender to a first group of one or more intended recipients. The process includes receiving a first message from the first sender to one or more intended recipients of the first group. The process includes changing the first message so that address information presented shows the first alias of the first sender.