System users that receive mail in /var/mail/systemuser?

[Andreas Metzler <ametzler@downhill.at.eu.org>]

Hello,
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
/etc/aliases?
            cu andreas
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