Updated: 2022/Sep/29

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POSTDROP(1)                 General Commands Manual                POSTDROP(1)

       postdrop - Postfix mail posting utility

       postdrop [-rv] [-c config_dir]

       The postdrop(1) command creates a file in the maildrop directory and
       copies its standard input to the file.


       -c config_dir
              The main.cf configuration file is in the named directory instead
              of the default configuration directory. See also the MAIL_CONFIG
              environment setting below.

       -r     Use a Postfix-internal protocol for reading the message from
              standard input, and for reporting status information on standard
              output. This is currently the only supported method.

       -v     Enable verbose logging for debugging purposes. Multiple -v
              options make the software increasingly verbose. As of Postfix
              2.3, this option is available for the super-user only.

       The command is designed to run with set-group ID privileges, so that it
       can write to the maildrop queue directory and so that it can connect to
       Postfix daemon processes.

       Fatal errors: malformed input, I/O error, out of memory. Problems are
       logged to syslogd(8) or postlogd(8) and to the standard error stream.
       When the input is incomplete, or when the process receives a HUP, INT,
       QUIT or TERM signal, the queue file is deleted.


              Directory with the main.cf file. In order to avoid exploitation
              of set-group ID privileges, a non-standard directory is allowed
              only if:

              ⊕      The name is listed in the standard main.cf file with the
                     alternate_config_directories configuration parameter.

              ⊕      The command is invoked by the super-user.

       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.

       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.

       config_directory (see 'postconf -d' output)
              The default location of the Postfix main.cf and master.cf
              configuration files.

       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.

       queue_directory (see 'postconf -d' output)
              The location of the Postfix top-level queue directory.

       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".

       trigger_timeout (10s)
              The time limit for sending a trigger to a Postfix daemon (for
              example, the pickup(8) or qmgr(8) daemon).

       Available in Postfix version 2.2 and later:

       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

       /var/spool/postfix/maildrop, maildrop queue

       sendmail(1), compatibility interface
       postconf(5), configuration parameters
       postlogd(8), Postfix logging
       syslogd(8), system logging

       The Secure Mailer license must be distributed with this software.

       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