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Man Pages
qmail-queue(8) FreeBSD System Manager's Manual qmail-queue(8)

qmail-queue - queue a mail message for delivery

qmail-queue

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 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 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.
qmail-queue always adds a Received line to the top of the message. Other than this, 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 qmail-header(5).
Programs included with qmail which invoke qmail-queue will invoke the contents of $QMAILQUEUE instead, if that environment variable is set.

qmail-queue imposes two constraints on the queue structure: each mess subdirectory must be in the same filesystem as the pid directory; and each todo subdirectory must be in the same filesystem as the intd directory.

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 qmail-queue error codes between 11 and 40 indicate permanent errors:
11
Address too long.
31
Mail server permanently refuses to send the message to any recipients. (Not used by qmail-queue, but can be used by programs offering the same interface.)
All other qmail-queue error codes indicate temporary errors:
51
Out of memory.
52
Timeout.
53
Write error; e.g., disk full.
54
Unable to read the message or envelope.
55
Unable to read a configuration file. (Not used by qmail-queue.)
56
Problem making a network connection from this host. (Not used by qmail-queue.)
61
Problem with the qmail home directory.
62
Problem with the queue directory.
63
Problem with queue/pid.
64
Problem with queue/mess.
65
Problem with queue/intd.
66
Problem with queue/todo.
71
Mail server temporarily refuses to send the message to any recipients. (Not used by qmail-queue.)
72
Connection to mail server timed out. (Not used by qmail-queue.)
73
Connection to mail server rejected. (Not used by qmail-queue.)
74
Connection to mail server succeeded, but communication failed. (Not used by qmail-queue.)
81
Internal bug; e.g., segmentation fault.
91
Envelope format error.

addresses(5), envelopes(5), qmail-header(5), qmail-inject(8), qmail-qmqpc(8), qmail-send(8), qmail-smtpd(8)

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