Why are mail files in /usr/mail are owned by daemon instead of the recipient?
The mail delivery agent /bin/rmail needs to be able to chown(2) these files. It can not do so if you have removed the privilege CHOWN (see setprivgrp(1m); removing CHOWN is recommended to prevent cheating on disk quotas). To get around this, noting that /bin/rmail runs setgid to group mail, you can grant privilege CHOWN to group mail only by inserting the line “mail CHOWN” in /etc/privgroup. The change takes effect on the next reboot, or immediately if you execute the command “setprivgrp -f /etc/privgroup”. (Thanks to Jim Richardson
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