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<h2><a href="mailfront.html">MailFront</a></h2>
<h1>qmail Backend</h1>
<p><ol>
<li>The qmail home directory is compiled into the program, and defaults
to <tt>/var/qmail</tt>, but may be overridden by <tt>$QMAILHOME</tt>.
<li>Messages are delivered through the executable named in
<tt>$QMAILQUEUE</tt>, or <tt>$QMAILHOME/bin/qmail-queue</tt> if it is
not set.
<li>If <tt>qmail-queue</tt> exits non-zero, the qmail backend looks for
an error message in <tt>$QQERRMSG_#</tt>, where <tt>#</tt> is the exit
code of <tt>qmail-queue</tt>. As usual, exit codes between 11 and 40
indicate permanent errors, and all others indicate temporary errors.
<li>The qmail-queue PID is logged in success messages for correlation
with the qmail logs.
</ol></p>
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