POSTDROP(1) General Commands Manual POSTDROP(1)
postdrop – Postfix mail posting utility
postdrop [-rv] [-c config_dir]
The postdrop command creates a file in the maildrop directory and
copies its standard input to the file.
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) 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
· 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 pro‐
gram. The text below provides only a parameter summary. See post‐
conf(5) for more details including examples.
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 main.cf and master.cf con‐
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.
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, “post‐
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:
List of users who are authorized to submit mail with the send‐
mail(1) command (and with the privileged postdrop helper com‐
/var/spool/postfix/maildrop, maildrop queue
sendmail, compatibility interface
postconf(5), configuration parameters
syslogd(8), system logging
The Secure Mailer license must be distributed with this software.
IBM T.J. Watson Research
P.O. Box 704
Yorktown Heights, NY 10598, USA
111 8th Avenue
New York, NY 10011, USA