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RedHat 9 (Linux i386) - man page for pickup (redhat section 8)

PICKUP(8)				       System Manager's Manual					    PICKUP(8)

pickup - Postfix local mail pickup
pickup [generic Postfix daemon options]
The pickup daemon waits for hints that new mail has been dropped into the maildrop directory, and feeds it into the cleanup(8) daemon. Ill-formatted files are deleted without notifying the originator. This program expects to be run from the master(8) process manager.
None. The pickup daemon does not interact with the outside world.
The pickup daemon runs with superuser privileges so that it 1) can open a queue file with the rights of the submitting user and 2) can access the Postfix private IPC channels. On the positive side, the program can run chrooted, opens no files for writing, is careful about what files it opens for reading, and does not actually touch any data that is sent to its public service endpoint.
Problems and transactions are logged to syslogd(8).
The pickup daemon copies mail from file to the cleanup(8) daemon. It could avoid message copying overhead by sending a file descriptor instead of file data, but then the already complex cleanup(8) daemon would have to deal with unfiltered user data.
The following main.cf parameters are especially relevant to this program. See the Postfix main.cf file for syntax details and for default values. Use the postfix reload command after a configuration change. Content inspection controls content_filter The name of a mail delivery transport that filters mail and that either bounces mail or re-injects the result back into Postfix. This parameter uses the same syntax as the right-hand side of a Postfix transport table. Miscellaneous always_bcc Address to send a copy of each message that enters the system. mail_owner The process privileges used while not opening a maildrop file. queue_directory Top-level directory of the Postfix queue.
cleanup(8) message canonicalization master(8) process manager sendmail(1), postdrop(8) mail posting agent syslogd(8) system logging
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 PICKUP(8)

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