Mailing lists can include Unix group specifications that will be expanded automatically. Handles mail being sent to other e-mail adresses, files, and programs in a secure fashion. Configuration is done with files in a directory heirarchy. All directives in a file are executed as the owner of that file, so users can update their own configurations without introducing security risks. Customer mailout list, if anyone in the organisation sends to it, it goes to the customers, if anyone else sends to it, the mail goes to the sales staff.
Postmaster can create default rejection rules than can be overridden by the users.
Requirements Unix system. Perl 5.004 or later.