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attempt, if the client attempts to send mail to a domain which is not
listed in rcpthosts, qmail-smtpd is unable to read morercpthosts.cdb.
Instead, it sends "421 unable to read controls (#4.3.0)" and drops the
connection. This patch fixes this bug by closing file descriptor 3
(only if necessary) in the authentication child process rather than
the parent process.
Credit: Tom Clegg
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