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For the most part, qmail works the way people expect it to work. There are, however, a few gotchas: quirks in qmail's behavior that frequently cause problems for beginners.
To prevent the possibility of qmail-local running commands as a privileged user, qmail ignores all users whose user ID is zero. This is documented in the qmail-getpw man page.
That doesn't mean qmail won't deliver to root, it just means that such a delivery will have to be handled by a non-privileged user. Typically, one creates an alias for root by populating /var/qmail/alias/.qmail-root with an entry that forwards to the system administrator's unprivileged account.
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