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+.TH s/qmail: qmail-queue 8
+.SH NAME
+qmail-queue \- queue a mail message for delivery
+.SH SYNOPSIS
+.B qmail-queue
+.SH DESCRIPTION
+.B qmail-queue
+reads a mail message from descriptor 0.
+It then reads envelope information from descriptor 1.
+It places the message into the outgoing queue
+for future delivery by
+.BR qmail-send .
+
+The envelope information is
+an envelope sender address
+followed by a list of envelope recipient addresses.
+The sender address is preceded by the letter F
+and terminated by a 0 byte.
+Each recipient address is preceded by the letter T
+and terminated by a 0 byte.
+The list of recipient addresses is terminated by an extra 0 byte.
+If
+.B qmail-queue
+sees end-of-file before the extra 0 byte,
+it aborts without placing the message into the queue.
+
+Every envelope recipient address
+should contain a username,
+an @ sign,
+and a fully qualified domain name.
+
+.B qmail-queue
+always adds a
+.B Received
+line to the top of the message.
+Other than this,
+.B qmail-queue
+does not inspect the message
+and does not enforce any restrictions on its contents.
+However, the recipients probably expect to see a proper header,
+as described in
+.BR qmail-header(5) .
+
+Programs included with qmail which invoke
+.B qmail-queue
+will invoke the contents of
+.B QMAILQUEUE
+instead, if that environment variable is set.
+.SH "FILESYSTEM RESTRICTIONS"
+.B qmail-queue
+imposes two constraints on the queue structure:
+each
+.B mess
+subdirectory must be in the same filesystem as the
+.B pid
+directory; and each
+.B todo
+subdirectory must be in the same filesystem as the
+.B intd
+directory.
+.SH "EXIT CODES"
+.B qmail-queue
+does not print diagnostics.
+It exits
+0 if
+it has successfully queued the message.
+It exits between 1 and 99 if
+it has failed to queue the message.
+
+All
+.B qmail-queue
+error codes between 11 and 40
+indicate permanent errors:
+.TP 5
+.B 11
+Address too long.
+.TP
+.B 31
+Mail server permanently refuses to send the message to any recipients.
+(Not used by
+.BR qmail-queue),
+.TP
+.B 32
+Mail server does not accept the message.
+(The message includes an identified virus.)
+.TP
+.B 33
+Mail server does not accept the message.
+(The message is identified as spam.)
+.TP
+.B 34
+Mail server does not accept the message.
+(The message carries an invalid MIME attachment.)
+.PP
+All other
+.B qmail-queue
+error codes indicate temporary errors:
+.TP 5
+.B 51
+Out of memory.
+.TP
+.B 52
+Timeout.
+.TP
+.B 53
+Write error; e.g., disk full.
+.TP
+.B 54
+Unable to read the message or envelope.
+.TP
+.B 55
+Unable to read a configuration file.
+The virus scanner called via the
+.BR QHPSI
+returned with return code other then
+0 or QHPSIRC. 
+.TP
+.B 56
+Problem making a network connection from this host.
+(Not used by
+.BR qmail-queue .)
+.TP
+.B 61
+Problem with the qmail home directory.
+.TP
+.B 62
+Problem with the queue directory.
+.TP
+.B 63
+Problem with queue/pid.
+.TP
+.B 64
+Problem with queue/mess.
+.TP
+.B 65
+Problem with queue/intd.
+.TP
+.B 66
+Problem with queue/todo.
+.TP
+.B 71
+Mail server temporarily refuses to send the message to any recipients.
+(Not used by
+.BR qmail-queue .)
+.TP
+.B 72
+Connection to mail server timed out.
+(Not used by
+.BR qmail-queue .)
+.TP
+.B 73
+Connection to mail server rejected.
+(Not used by
+.BR qmail-queue .)
+.TP
+.B 74
+Connection to mail server succeeded,
+but communication failed.
+(Not used by
+.BR qmail-queue .)
+.TP
+.B 81
+Internal bug; e.g., segmentation fault.
+.TP
+.B 91
+Envelope format error.
+.SH "QHPSI ARGUMENTS"
+The Qmail High Performance Scanner interface QHPSI allows
+.B qmail-queue
+to read up to seven arguments taken from the environment to be used
+as a call-interface for an external virus scanner:
+.TP 5
+.B QHPSI
+is set to the file name of the virus scanner, ie. QHPSI='/usr/local/bin/clamscan'.
+The path can be omitted, if the virus scanner is in the default path.
+.TP
+.B QHPSIARG1...3
+Optional additional arguments can be included here, ie. QHPSIARG1="--verbose". 
+Useful to suppress output in case an email is
+clean and to enable mailbox support for the virus scanner.
+.TP
+.B QHPSIRC
+To specify the return code of the virus scanner in case of an infection; default is 1.
+.TP
+.B QHPSIMINSIZE
+The minimal size of the message to invoke the virus scanner; default is 0.
+A typical choice would be QHPSIMINSIZE=10000 (~10k).
+.TP
+.B QHPSIMAXSIZE
+The maximal size of the message to invoke the virus scanner; default is unrestricted.
+A typical choice would be QHPSIMAXSIZE=1000000 (~1M).
+.SH "SEE ALSO"
+addresses(5),
+envelopes(5),
+qmail-header(5),
+qmail-inject(8),
+qmail-qmqpc(8),
+qmail-send(8),
+qmail-smtpd(8)