Ubuntu Manpage: nullmailer-send - Send queued messages

Provided by: nullmailer_2.2+10~g7ed88a0-6_amd64

NAME

       nullmailer-send - Send queued messages

SYNOPSIS

       nullmailer-send

DESCRIPTION

This program is responsible for coordinating the transmission of messages that have been queued by
nullmailer-queue. It uses a variety of protocol modules to deliver the messages from the queue to remote
"smart" servers.

When the program starts, the queue is scanned to build a list of messages to send. The queue is
rescanned when either the trigger is pulled, or after pausetime seconds have elapsed after the last
failed delivery. When there are no messages in the queue, nullmailer does no rescanning until the
trigger is pulled. Pulling the trigger consists of opening up the trigger named pipe and writing a
single byte to it, which causes this program to be awakened (if it's not already processing the queue).
This procedure is done by nullmailer-queue to ensure that messages are delivered immediately. You can
start delivery by hand from the command line like this:

echo 1 > trigger

Delivery of messages consists of reading the list of remote servers and then trying to deliver the
messages to these servers as follows. For each remote in the list, the named protocol handler is
executed once for each message remaining in the queue. If the protocol handler succeeds, the message is
removed from the queue and processing continues with the next message. If the protocol handler reports a
permanent failure or the message has been in the queue longer than queuelifetime, the message is moved
into the failed queue and a bounce message is generated with nullmailer-dsn. If any messages remain in
the queue, processing of the remaining messages continues with the next remote. When all the remotes
have been tried, nullmailer-send sleeps for a number of seconds specified by pausetime before retrying
sending the contents of the queue.

CONTROL FILES

All the control files are reread each time the queue is run.

helohost
Sets the environment variable $HELOHOST which is used by the SMTP protocol module to set the
parameter given to the HELO command. Defaults to the value of the me configuration file.

maxpause
The maximum time to pause between successive queue runs, in seconds. Defaults to 24 hours
(86400).

pausetime
The minimum time to pause between successive queue runs when there are messages in the queue, in
seconds. Defaults to 1 minute (60). Each time this timeout is reached, the timeout is doubled to
a maximum of maxpause. After new messages are injected, the timeout is reset. If this is set to
0, nullmailer-send will exit immediately after going through the queue once (one-shot mode).

queuelifetime
The maximum time a message is allowed to live in the queue before being considered permanently
failed, in seconds. Defaults to 7 days (604800).

remotes
This file contains a list of remote servers to which to send each message. Each line of this file
contains a remote host name or address followed by an optional protocol string, separated by white
space. The protocol name defaults to smtp, and may be followed by additional options for that
module. See the "PROTOCOL OPTIONS" section for a list of the available options. The options may
optionally be prefixed by -- but this is not required. The line is parsed according to standard
shell quoting rules. For example, to connect to port 2525 on your SMTP smart host, which also
requires SMTP authentication, and initiate TLS with STARTTLS, use:

smarthost.dom smtp port=2525 starttls user=user pass='my pass phrase'

Blank lines and lines starting with a pound (#) are ignored.

sendtimeout
The time to wait for a remote module listed above to complete sending a message before killing it
and trying again, in seconds. Defaults to 1 hour (3600). If this is set to 0, nullmailer-send
will wait forever for messages to complete sending.

PROTOCOL OPTIONS

port=PORT
Set an alternate port number to connect to on the remote host. For example, SMTP may use port=587
for the alternate SMTP "submission" port.

user=USERNAME
Set the SMTP authentication user name.

pass=PASSWORD
Set the SMTP authentication password.

source=HOSTNAME
Set the source address for connections to the remote host.

auth-login
Force SMTP "AUTH LOGIN" mode instead of auto-detecting.

auth-external
Use SMTP "AUTH EXTERNAL" for TLS client certificate authentication.

tls Connect using TLS. This will automatically switch the default port to 465.

ssl Alias for the tls option for compatibility.

starttls
Use the STARTTLS command to initiate a TLS session.

x509certfile=FILENAME
Set the filename for a TLS client certificate to send to the server.

x509keyfile=FILENAME
Set the filename for the private key for a TLS client certificate. Defaults to the same file name
as x509certfile.

x509cafile=FILENAME
Set the TLS certificate authority trust filename. Defaults to /etc/ssl/certs/ca-certificates.crt.

x509crlfile=FILENAME
Set the TLS certificate revocation list filename.

x509fmtder
Specify that TLS X.509 files above are in DER format instead of PEM.

insecure
Don't abort a TLS connection if the server certificate fails validation. Use this only if you
know the server uses an invalid certificate.

tls-anon-auth
Use TLS anonymous authentication - replacing certificate authentication. This means no external
certificates or passwords are needed to set up the connection. With this option your connection
is vulnerable to man-in-the-middle (active or redirection) attacks. However, the data are
integrity protected and encrypted from passive eavesdroppers. This option must be used with the
insecure option - to acknowledge that you know what you are doing.

FILES