Both postqueue[1] and postdrop[2] implement a subset of administration task that are supposed to be run unprivileged users and require the setgid bit to full-fill this task. [1] http://www.postfix.org/postqueue.1.html [2] http://www.postfix.org/postdrop.1.html
*** NixOS *** NixOS is a Linux distribution based on the purely functional package management system Nix. More information can be found at http://nixos.org/nixos and in the manual in doc/manual.