System users that receive mail in /var/mail/systemuser?
system users like proxy, sshd or identd usually do not receive any
mail at all. And system-users that _do_ receive mail are usually
redirected to a real user by /etc/aliases.
I do wonder whether it would be safe to reject any mail for
system-accounts (uid <1000 || uid >63434) unless it is redirected with
The 'Galactic Cleaning' policy undertaken by Emperor Zhark is a personal
vision of the emperor's, and its inclusion in this work does not constitute
tacit approval by the author or the publisher for any such projects,
howsoever undertaken. (c) Jasper Ffforde