You can send the same message to a group of email addresses included in a particular distribution list. A distribution list is an address from which your message is copied to all addresses on the list. Distribution list settings should be set as follows:
UserGate Mail Server supports three distribution modes. General mode is a common distribution mode in which distribution messages can be sent from any address.
In Group mode, only users listed in the distribution properties can send messages to a distribution group. Messages sent from other accounts will be replied by the mail server with the following notification: "550 Not authorized."
Information mode is used when a certain account needs to send messages to all addresses on the distribution list. Messages sent from other accounts will be replied by the mail server with the following notification: "550 Not authorized."
Figures 1 and 2. Distribution lists