NAME
sendmail - Postfix to Sendmail compatibility interface
SYNOPSIS
sendmail [option ...] [recipient ...]
mailq
sendmail -bp
newaliases
sendmail -I
DESCRIPTION
The Postfix sendmail(1) command implements the Postfix to Sendmail com‐ patibility 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 opera‐ tion:
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. The queue ID string is followed by an optional status character:
* The message is in the active queue, i.e. the message is
selected for delivery.
! The message is in the hold queue, i.e. no further deliv‐
ery attempt will be made until the mail is taken off
hold.
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 parame‐ ter. 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.
-bl Go into daemon mode. To accept only local connections as with Sendmail´s -bl option, specify “inet_interfaces = loopback” in the Postfix main.cf configuration file.
-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 Postfix version 3.2 and later, a non-default directory must
be authorized in the default main.cf file, through the alter‐
nate_config_directories or multi_instance_directories parame‐
ters.
With all Postfix versions, you can specify a directory pathname
with the MAIL_CONFIG environment variable to override the loca‐
tion of configuration files.
-F full_name Set the sender full name. This overrides the NAME environment variable, and is used only with messages that have no From: mes‐ sage 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 submis‐ sion. Either do not rewrite addresses at all, or update incom‐ plete 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 notifica‐ tion when delivery fails), delay (send notification when deliv‐ ery 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) Set the named option to value. Use the equivalent configuration parameter in main.cf instead.
-o7 (ignored)
-o8 (ignored) To send 8-bit or binary content, use an appropriate MIME encap‐ sulation 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 parame‐ ter 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 Delivery status notification control. Specify “hdrs” to return only the header when a message bounces, “full” to return a full copy (the default behavior).
The -R option specifies an upper bound; Postfix will return only
the header, when a full copy would exceed the bounce_size_limit
setting.
This option is ignored before Postfix version 2.10.
-q Attempt to deliver all queued mail. This is implemented by exe‐ cuting 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 config‐ uration parameter instead.
-qIqueueid Schedule immediate delivery of mail with the specified queue ID. This option is implemented by executing the postqueue(1) com‐ mand, and is available with Postfix version 2.4 and later.
-qRsite Schedule immediate delivery of all mail that is queued for the named site. This option accepts only site names that are eligi‐ ble for the “fast flush” service, and is implemented by execut‐ ing 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 = charac‐
ters are configurable with the default_verp_delimiters configu‐
ration 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_delim‐ iters configuration parameter.
-v Send an email report of the first delivery attempt (Postfix ver‐ sions 2.1 and later). Mail delivery always happens in the back‐ ground. When multiple -v options are given, enable verbose log‐ ging 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, possibly remote, users. 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 (value does not matter)
Enable verbose logging for debugging purposes.
MAIL_DEBUG (value does not matter)
Enable debugging with an external command, as specified with the
debugger_command configuration parameter.
NAME The sender full name. This is used only with messages that have
no From: message header. See also the -F option above.
CONFIGURATION PARAMETERS
The following main.cf parameters are especially relevant to this pro‐
gram. The text below provides only a parameter summary. See post‐
conf(5) for more details including examples.
COMPATIBILITY CONTROLS
Available with Postfix 2.9 and later:
sendmail_fix_line_endings (always)
Controls how the Postfix sendmail command converts email message
line endings from <CR><LF> into UNIX format (<LF>).
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 $debug_peer_level.
ACCESS CONTROLS
Available in Postfix version 2.2 and later:
authorized_flush_users (static:anyone)
List of users who are authorized to flush the queue.
authorized_mailq_users (static:anyone)
List of users who are authorized to view the queue.
authorized_submit_users (static:anyone)
List of users who are authorized to submit mail with the send‐
mail(1) command (and with the privileged postdrop(1) helper com‐
mand).
RESOURCE AND RATE CONTROLS
bounce_size_limit (50000)
The maximal amount of original message text that is sent in a
non-delivery notification.
fork_attempts (5)
The maximal number of attempts to fork() a child process.
fork_delay (1s)
The delay between attempts to fork() a child process.
hopcount_limit (50)
The maximal number of Received: message headers that is allowed
in the primary message headers.
queue_run_delay (300s)
The time between deferred queue scans by the queue manager;
prior to Postfix 2.4 the default value was 1000s.
FAST FLUSH CONTROLS
The ETRN_README file describes configuration and operation details for
the Postfix "fast flush" service.
fast_flush_domains ($relay_domains)
Optional list of destinations that are eligible for per-destina‐
tion 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 con‐
figuration files.
daemon_directory (see 'postconf -d' output)
The directory with Postfix support programs and daemon programs.
default_database_type (see 'postconf -d' output)
The default database type for use in newaliases(1), postalias(1)
and postmap(1) commands.
delay_warning_time (0h)
The time after which the sender receives a copy of the message
headers of mail that is still queued.
import_environment (see 'postconf -d' output)
The list of environment parameters that a privileged Postfix
process will import from a non-Postfix parent process, or
name=value environment overrides.
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 (see 'postconf -d' output)
A prefix that is prepended to the process name in syslog
records, so that, for example, "smtpd" becomes "prefix/smtpd".
Postfix 3.2 and later:
alternate_config_directories (empty)
A list of non-default Postfix configuration directories that may
be specified with "-c config_directory" on the command line (in
the case of sendmail(1), with the "-C" option), or via the
MAIL_CONFIG environment parameter.
multi_instance_directories (empty)
An optional list of non-default Postfix configuration directo‐
ries; these directories belong to additional Postfix instances
that share the Postfix executable files and documentation with
the default Postfix instance, and that are started, stopped,
etc., together with the default Postfix instance.
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
Wietse Venema
Google, Inc.
111 8th Avenue
New York, NY 10011, USA
SENDMAIL(1)