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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 direc-
tory, 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 man-
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
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 syn-
tax as the right-hand side of a Postfix transport table.
Address to send a copy of each message that enters the system.
The process privileges used while not opening a maildrop file.
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.
IBM T.J. Watson Research
P.O. Box 704
Yorktown Heights, NY 10598, USA
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