Lotus Notes

Restricting users from sending mail to groups in the Domino Directory
By default, all users can send mail to groups defined in the Domino® Directory. To reduce unnecessary mail traffic, you can edit the reader fields for a Group document to restrict access to the group, specifying the users who are allowed to send mail to the group. Only users to whom you grant reader access can send mail addressed to the group. Users who do not have reader access to the group will not be able see the group name listed in the Domino Directory. 
 
 
 About this task 
 The restrictions apply to messages sent to either a group's Notes® address or its Internet address and to messages originating from a Notes client as well as messages sent and received over SMTP (as from an IMAP or Notes client). From a Notes client, a user who does not have permission to use the group receives an error when attempting to send mail to the restricted group. If the same user attempts to mail from a POP3 or IMAP client, the Router generates a Nondelivery report indicating that the sender is not authorized to send mail to the specified recipient. 
 
 
 Procedure 
 
 From the Domino Administrator, click the  People & Groups  tab, expand the Domino Directory that contains the group you want to restrict access to, and select the  Groups  view. 
 Right-click the Group document to manage and choose  Document Properties . 
 Select the  Security  tab (the key). 
 Clear the  All readers and above  checkbox to enable editing of the readers list. 
 To enable a user to send mail to the group, select the user's name in the list. 
 To provide access to users not listed, click the Person icon, add the name in the  Select Names  dialog box, and click  OK . The user's name appears at the end of the list with a check next to it. 
 Deselect the names of users you want to prevent from sending mail to the group, including the Anonymous entry. 
 Close the  Document Properties  dialog box.