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 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) 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 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 file with the
                 alternate_config_directories configuration parameter.

          *      The command is invoked by the super-user.


   The following  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, or
          via the MAIL_CONFIG environment parameter.

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

   import_environment (see 'postconf -d' output)
          The  list  of environment parameters that a Postfix process will
          import from a non-Postfix parent process.

   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)
          The mail system name that is prepended to the  process  name  in
          syslog   records,   so   that   "smtpd"  becomes,  for  example,

   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
   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



Personal Opportunity - Free software gives you access to billions of dollars of software at no cost. Use this software for your business, personal use or to develop a profitable skill. Access to source code provides access to a level of capabilities/information that companies protect though copyrights. Open source is a core component of the Internet and it is available to you. Leverage the billions of dollars in resources and capabilities to build a career, establish a business or change the world. The potential is endless for those who understand the opportunity.

Business Opportunity - Goldman Sachs, IBM and countless large corporations are leveraging open source to reduce costs, develop products and increase their bottom lines. Learn what these companies know about open source and how open source can give you the advantage.

Free Software

Free Software provides computer programs and capabilities at no cost but more importantly, it provides the freedom to run, edit, contribute to, and share the software. The importance of free software is a matter of access, not price. Software at no cost is a benefit but ownership rights to the software and source code is far more significant.

Free Office Software - The Libre Office suite provides top desktop productivity tools for free. This includes, a word processor, spreadsheet, presentation engine, drawing and flowcharting, database and math applications. Libre Office is available for Linux or Windows.

Free Books

The Free Books Library is a collection of thousands of the most popular public domain books in an online readable format. The collection includes great classical literature and more recent works where the U.S. copyright has expired. These books are yours to read and use without restrictions.

Source Code - Want to change a program or know how it works? Open Source provides the source code for its programs so that anyone can use, modify or learn how to write those programs themselves. Visit the GNU source code repositories to download the source.


Study at Harvard, Stanford or MIT - Open edX provides free online courses from Harvard, MIT, Columbia, UC Berkeley and other top Universities. Hundreds of courses for almost all major subjects and course levels. Open edx also offers some paid courses and selected certifications.

Linux Manual Pages - A man or manual page is a form of software documentation found on Linux/Unix operating systems. Topics covered include computer programs (including library and system calls), formal standards and conventions, and even abstract concepts.