/usr/lib/mailman/scripts/post is in mailman 1:2.1.26-1.
This file is owned by root:list, with mode 0o644.
The actual contents of the file can be viewed below.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 | # -*- python -*-
#
# Copyright (C) 1998,1999,2000,2001,2002 by the Free Software Foundation, Inc.
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
# 
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
# 
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software 
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
"""Accept posts to a list and handle them properly.
The main advertised address for a list should be filtered to this program,
through the mail wrapper.  E.g. for list `test@yourdomain.com', the `test'
alias would deliver to this script.
Stdin is the mail message, and argv[1] is the name of the target mailing list.
"""
import sys
import paths
from Mailman import mm_cfg
from Mailman import Utils
from Mailman.i18n import _
from Mailman.Queue.sbcache import get_switchboard
from Mailman.Logging.Utils import LogStdErr
LogStdErr("error", "post")
def main():
    # TBD: If you've configured your list or aliases so poorly as to get
    # either of these first two errors, there's little that can be done to
    # save your messages.  They will be lost.  Minimal testing of new lists
    # should avoid either of these problems.
    try:
        listname = sys.argv[1]
    except IndexError:
        print >> sys.stderr, _('post script got no listname.')
        sys.exit(1)
    # Make sure the list exists
    if not Utils.list_exists(listname):
        print >> sys.stderr, _('post script, list not found: %(listname)s')
        sys.exit(1)
    # Immediately queue the message for the incoming qrunner to process.  The
    # advantage to this approach is that messages should never get lost --
    # some MTAs have a hard limit to the time a filter prog can run.  Postfix
    # is a good example; if the limit is hit, the proc is SIGKILL'd giving us
    # no chance to save the message.
    inq = get_switchboard(mm_cfg.INQUEUE_DIR)
    inq.enqueue(sys.stdin.read(),
                listname=listname,
                tolist=1, _plaintext=1)
if __name__ == '__main__':
    main()
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