The Postfix sendmail(1) command implements the Postfix
to Sendmail compatibility interface.
For the sake of compatibility with existing applications, some
Sendmail command-line options are recognized but silently ignored.
By default, Postfix sendmail(1) reads a message from
standard input
until EOF or until it reads a line with only a . character,
and arranges for delivery. Postfix sendmail(1) relies on the
postdrop(1) command to create a queue file in the maildrop
directory.
Specific command aliases are provided for other common modes of
operation:
mailq
List the mail queue. Each entry shows the queue file ID, message
size, arrival time, sender, and the recipients that still need to
be delivered. If mail could not be delivered upon the last attempt,
the reason for failure is shown. This mode of operation is implemented
by executing the postqueue(1) command.
newaliases
Initialize the alias database. If no input file is specified (with
the -oA option, see below), the program processes the file(s)
specified with the alias_database configuration parameter.
If no alias database type is specified, the program uses the type
specified with the default_database_type configuration parameter.
This mode of operation is implemented by running the postalias(1)
command.
Note: it may take a minute or so before an alias database update
becomes visible. Use the "postfix reload" command to eliminate
this delay.
These and other features can be selected by specifying the
appropriate combination of command-line options. Some features are
controlled by parameters in the main.cf configuration file.
The following options are recognized:
-Am (ignored)
-Ac (ignored)
Postfix sendmail uses the same configuration file regardless of
whether or not a message is an initial submission.
-B body_type
The message body MIME type: 7BIT or 8BITMIME.
-bd
Go into daemon mode. This mode of operation is implemented by
executing the "postfix start" command.
-bh (ignored)
-bH (ignored)
Postfix has no persistent host status database.
-bi
Initialize alias database. See the newaliases
command above.
-bm
Read mail from standard input and arrange for delivery.
This is the default mode of operation.
-bp
List the mail queue. See the mailq command above.
-bs
Stand-alone SMTP server mode. Read SMTP commands from
standard input, and write responses to standard output.
In stand-alone SMTP server mode, mail relaying and other
access controls are disabled by default. To enable them,
run the process as the mail_owner user.
This mode of operation is implemented by running the
smtpd(8) daemon.
-bv
Do not collect or deliver a message. Instead, send an email
report after verifying each recipient address. This is useful
for testing address rewriting and routing configurations.
This feature is available in Postfix version 2.1 and later.
-C config_file
-C config_dir
The path name of the Postfix main.cf file, or of its
parent directory. This information is ignored with Postfix
versions before 2.3.
With all Postfix versions, you can specify a directory pathname
with the MAIL_CONFIG environment variable to override the
location of configuration files.
-F full_name
Set the sender full name. This is used only with messages that
have no From: message header.
-f sender
Set the envelope sender address. This is the address where
delivery problems are sent to. With Postfix versions before 2.1, the
Errors-To: message header overrides the error return address.
-G
Gateway (relay) submission, as opposed to initial user
submission. Either do not rewrite addresses at all, or
update incomplete addresses with the domain information
specified with remote_header_rewrite_domain.
This option is ignored before Postfix version 2.3.
-h hop_count (ignored)
Hop count limit. Use the hopcount_limit configuration
parameter instead.
-I
Initialize alias database. See the newaliases
command above.
-i
When reading a message from standard input, don't treat a line
with only a . character as the end of input.
-L label (ignored)
The logging label. Use the syslog_name configuration
parameter instead.
-m (ignored)
Backwards compatibility.
-N dsn (default: 'delay, failure')
Delivery status notification control. Specify either a
comma-separated list with one or more of failure (send
notification when delivery fails), delay (send
notification when delivery is delayed), or success
(send notification when the message is delivered); or specify
never (don't send any notifications at all).
This feature is available in Postfix 2.3 and later.
-n (ignored)
Backwards compatibility.
-oAalias_database
Non-default alias database. Specify pathname or
type:pathname. See postalias(1) for
details.
-O option=value (ignored)
Backwards compatibility.
-o7 (ignored)
-o8 (ignored)
To send 8-bit or binary content, use an appropriate MIME encapsulation
and specify the appropriate -B command-line option.
-oi
When reading a message from standard input, don't treat a line
with only a . character as the end of input.
-om (ignored)
The sender is never eliminated from alias etc. expansions.
-o x value (ignored)
Set option x to value. Use the equivalent
configuration parameter in main.cf instead.
-r sender
Set the envelope sender address. This is the address where
delivery problems are sent to. With Postfix versions before 2.1, the
Errors-To: message header overrides the error return address.
-R return_limit (ignored)
Limit the size of bounced mail. Use the bounce_size_limit
configuration parameter instead.
-q
Attempt to deliver all queued mail. This is implemented by
executing the postqueue(1) command.
Warning: flushing undeliverable mail frequently will result in
poor delivery performance of all other mail.
-qinterval (ignored)
The interval between queue runs. Use the queue_run_delay
configuration parameter instead.
-qRsite
Schedule immediate delivery of all mail that is queued for the named
site. This option accepts only site names that are
eligible for the "fast flush" service, and is implemented by
executing the postqueue(1) command.
See flush(8) for more information about the "fast flush"
service.
-qSsite
This command is not implemented. Use the slower "sendmail -q"
command instead.
-t
Extract recipients from message headers. These are added to any
recipients specified on the command line.
With Postfix versions prior to 2.1, this option requires that
no recipient addresses are specified on the command line.
-U (ignored)
Initial user submission.
-V envid
Specify the envelope ID for notification by servers that
support DSN.
This feature is available in Postfix 2.3 and later.
-XV (Postfix 2.2 and earlier: -V)
Variable Envelope Return Path. Given an envelope sender address
of the form owner-listname@origin, each recipient
user@domain receives mail with a personalized envelope
sender address.
By default, the personalized envelope sender address is
owner-listname+user=domain@origin. The default
+ and = characters are configurable with the
default_verp_delimiters configuration parameter.
-XVxy (Postfix 2.2 and earlier: -Vxy)
As -XV, but uses x and y as the VERP delimiter
characters, instead of the characters specified with the
default_verp_delimiters configuration parameter.
-v
Send an email report of the first delivery attempt (Postfix
versions 2.1 and later). Mail delivery
always happens in the background. When multiple -v
options are given, enable verbose logging for debugging purposes.
-X log_file (ignored)
Log mailer traffic. Use the debug_peer_list and
debug_peer_level configuration parameters instead.
SECURITY
By design, this program is not set-user (or group) id. However,
it must handle data from untrusted users or untrusted machines.
Thus, the usual precautions need to be taken against malicious
inputs.
DIAGNOSTICS
Problems are logged to syslogd(8) and to the standard error
stream.
ENVIRONMENT
MAIL_CONFIG
Directory with Postfix configuration files.
MAIL_VERBOSE
Enable verbose logging for debugging purposes.
MAIL_DEBUG
Enable debugging with an external command, as specified with the
debugger_command configuration parameter.
CONFIGURATION PARAMETERS
The following main.cf parameters are especially relevant to
this program.
The text below provides only a parameter summary. See
postconf(5) for more details including examples.
TROUBLE SHOOTING CONTROLS
The DEBUG_README file gives examples of how to trouble shoot a
Postfix system.
debugger_command (empty)
The external command to execute when a Postfix daemon program is
invoked with the -D option.
debug_peer_level (2)
The increment in verbose logging level when a remote client or
server matches a pattern in the debug_peer_list parameter.
debug_peer_list (empty)
Optional list of remote client or server hostname or network
address patterns that cause the verbose logging level to increase
by the amount specified in $debug_peer_level.
ACCESS CONTROLS
Available in Postfix version 2.2 and later:
authorized_flush_users (static:anyone)
List of users who are authorized to flush the queue.
authorized_mailq_users (static:anyone)
List of users who are authorized to view the queue.
authorized_submit_users (static:anyone)
List of users who are authorized to submit mail with the sendmail(1)
command (and with the privileged postdrop(1) helper command).
RESOURCE AND RATE CONTROLS
bounce_size_limit (50000)
The maximal amount of original message text that is sent in a
non-delivery notification.
fork_attempts (5)
The maximal number of attempts to fork() a child process.
fork_delay (1s)
The delay between attempts to fork() a child process.
hopcount_limit (50)
The maximal number of Received: message headers that is allowed
in the primary message headers.
queue_run_delay (1000s)
The time between deferred queue scans by the queue manager.
FAST FLUSH CONTROLS
The ETRN_README file describes configuration and operation
details for the Postfix "fast flush" service.
fast_flush_domains ($relay_domains)
Optional list of destinations that are eligible for per-destination
logfiles with mail that is queued to those destinations.
VERP CONTROLS
The VERP_README file describes configuration and operation
details of Postfix support for variable envelope return
path addresses.
default_verp_delimiters (+=)
The two default VERP delimiter characters.
verp_delimiter_filter (-=+)
The characters Postfix accepts as VERP delimiter characters on the
Postfix sendmail(1) command line and in SMTP commands.
MISCELLANEOUS CONTROLS
alias_database (see 'postconf -d' output)
The alias databases for local(8) delivery that are updated with
"newaliases" or with "sendmail -bi".
command_directory (see 'postconf -d' output)
The location of all postfix administrative commands.
config_directory (see 'postconf -d' output)
The default location of the Postfix main.cf and master.cf
configuration files.
daemon_directory (see 'postconf -d' output)
The directory with Postfix support programs and daemon programs.
The time after which the sender receives the message headers of
mail that is still queued.
enable_errors_to (no)
Report mail delivery errors to the address specified with the
non-standard Errors-To: message header, instead of the envelope
sender address (this feature is removed with Postfix version 2.2, is
turned off by default with Postfix version 2.1, and is always turned on
with older Postfix versions).
mail_owner (postfix)
The UNIX system account that owns the Postfix queue and most Postfix
daemon processes.
queue_directory (see 'postconf -d' output)
The location of the Postfix top-level queue directory.
remote_header_rewrite_domain (empty)
Don't rewrite message headers from remote clients at all when
this parameter is empty; otherwise, rewrite message headers and
append the specified domain name to incomplete addresses.
syslog_facility (mail)
The syslog facility of Postfix logging.
syslog_name (postfix)
The mail system name that is prepended to the process name in syslog
records, so that "smtpd" becomes, for example, "postfix/smtpd".
trigger_timeout (10s)
The time limit for sending a trigger to a Postfix daemon (for
example, the pickup(8) or qmgr(8) daemon).
FILES
/var/spool/postfix, mail queue
/etc/postfix, configuration files
SEE ALSO
pickup(8), mail pickup daemon
qmgr(8), queue manager
smtpd(8), SMTP server
flush(8), fast flush service
postsuper(1), queue maintenance
postalias(1), create/update/query alias database
postdrop(1), mail posting utility
postfix(1), mail system control
postqueue(1), mail queue control
syslogd(8), system logging
README_FILES
Use "postconf readme_directory" or
"postconf html_directory" to locate this information.
DEBUG_README, Postfix debugging howto
ETRN_README, Postfix ETRN howto
VERP_README, Postfix VERP howto
LICENSE
The Secure Mailer license must be distributed with this software.
AUTHOR(S)
Wietse Venema
IBM T.J. Watson Research
P.O. Box 704
Yorktown Heights, NY 10598, USA
