What about email address lists?

Electronic mailing lists are usually fully or partially automated through the use of special mailing list software and a reflector address that are set up on a server capable of receiving e-mail. Incoming messages sent to the reflector address are processed by the software, and, depending on their content, are acted upon internally (in the case of messages containing commands directed at the software itself) or are distributed to all e-mail addresses subscribed to the mailing list. Depending on the software, additional addresses may be set up for the purpose of sending commands.